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No, you cannot avoid pecking. Just like dogs or wolves in a pack or cattle or horses in a herd, each animal needs to know its place in the social order so they can coexist peacefully. They all do that with some sort of fighting or intimidation. It is kind of ironic that to learn how to live together peacefully, they have to fight. A lot of times it is more intimidation than fighting, but not always.
As I am sure you know, people integrate chickens into their flocks all the time, usually successfully. But sometimes there are disasters. You cannot always prevent it, but there are some things you can do to improve your odds.
There are two types of pecking. One type is not meant to kill. It is more of a discipline pecking. Sometimes mother hens peck their chicks. This is not an attempt to kill the chick but to discipline it. If she tells it to do something and it does not pay proper respect to its Mama, she lets it know in no uncertain terms it ought to listen to Mama. Sometimes a chicken lower in the pecking order invades the personal space of a chicken higher in the pecking order. A sharp peck reinforces that it is bad manners to invade a superiors personal space. The two times I see this most in effect is around the feeders and on the roosts. Usually, if they have room, the one that is being reminded what passes for good manners in chicken etiquette runs away and the incident is over. If they don't have room to move away, then that can escalate into real violence. The more space you can give them to avoid each other, the better. This disciplinary pecking can be quite hard and if they hit the other chicken wrong, they can cause damage, but this is not intended to kill and is not all that risky.
Some flocks have chickens that go way beyond this. They seem to go on search and destroy missions, seeking out chickens lower in the pecking order to kill them. It is usually a hen, but it is possible it could be a rooster. I'd venture that most flocks do not have chickens like this, but they do exist. They will go after young chicks with a broody (Most broodies will defend their chicks from this type of chicken, but some don't) or any younger, weaker chicken. So the personality of your chickens plays a big part on how well the integration will go. I can't tell you what the personalities of your hens are. Until you put the younger ones with them, you will not know.
Sometimes when one chicken cannot easily intimidate the other, they will fight. Usually, they will determine pretty quickly which one wins and it is over, but sometimes one gets hurt. I find that size has little to do with it. Some may be bigger but the smaller is probably quicker, which can give it an advantage. It is not all that unusual for a bantam rooster to be dominant over a full grown rooster. It is the spirit and desire in the chicken that counts a lot more than the size. This is with chickens that have about the same maturity level.
If there is a difference in maturity, the more mature chicken will dominate, at least up until they reach a certain adult maturity level. The younger ones instinctively know that the more mature ones are a risk, or they learn this very quickly. They learn the best thing to do is to avoid the older ones. You'll see the younger ones crowding as far away from the other on the roost as they can get, sometimes even choosing to sleep in the nest boxes if the roosts are too rough. That is where more than the absolute minimum roost space comes in handy. If I leave mine locked in the coop and run when I have young ones, the young ones will spend most of the day perched on the roosts where the older ones are less likely to bother them. They are fully integrated and I can leave them locked in the coop all day without them killing each other, but the young ones do try to stay out of the way.
Some things that I think will help your odds. House them as you are, where they can see each other but not get to each other. Throwing scratch or something on the ground where they eat next to each other is a good idea.
When you integrate them, provide as much space as possible. Give then room to avoid each other to avoid conflicts.
I find it beneficial, when they first integrate, to allow them to run together during the day but let them have different sleeping quarters. Sometimes it is really hard for the younger to avoid the older on the roosts. They usually return to where they are used to sleeping. I suspect you have a small coop for the two and a larger one for the four. For a while, leave the smaller coop available for roosting. They may immediately go in with the big girls, but they may decide to wait until they mature some more. Eventually, they should move in with the big girls on their own.
Set up separate eating and drinking stations as far apart as reasonable. A favorite intimidation tactic is for the older ones to not allow the younger to eat or drink. Even a third eating station is not unreasonable. Make it as hard on the bullies as you can.
I'm not a big fan of putting them together after it is dark. Let me say it may help. I really don't know. I think they have to determine a pecking order so they know how to act with each other. If they wake up with strange new chickens, how do they know which ones can go eat first or be first out the pop door? Some integrations go pretty smoothly and some are pretty rough. Again, let me say I don't know if it helps or not, but I suspect the biggest advantage of letting them wake up together is that the initial pecking order stuff is handled before the human is around to interfere. When I integrate younger chickens with my flock, I make sure that pop door is open before they are fully awake so the younger ones can escape, say for about the first week.
My situation is different to yours. I free range mine so they have all kinds of room to avoid each other. I have a rooster that usually does not involve himself with pecking order issues, but he will break up serious fights. He also protects all member of his flock. Not all roosters do that. I do consider myself lucky in that respect. I know this does not have anything to do with your situation, but I'll make this post a little longer by telling a cute story. On different occasions, I've had a broody get separated from some of her chicks, going out a gate and turning back along the fence before all the chicks follow her out. So you wind up with a broody on one side of the fence and several of the chicks on the other side. They have no concept of gate. I've seen the rooster go set with the separated chicks until Mama works it out.
I wish you luck on your integration. I can't guarantee you anything on how your integration goes, I just hope it goes well.
