Oh no - not that. If you have a run, and do a lot of free ranging, I would lock the layers out of the run. Let the chicks have run of the run. I train mine to sleep in an enclosed dog crate, so I just set the crate out in the run in a safety zone, and near dark, they go into it. I head down the first couple of nights to make sure they get there before dark, so I can see. Then I just place the crate in the coop, with the door latched, in the morning, I open the latch and they find their way out to the run with the safety zone. With in a week, they will actually find the crate in the coop, if your coop is not too hard for chicks to get into.
In the run, I section off an area with lattice or pallets, or fencing materials that are big enough that the chicks go through it like water, and too small for hens to go through it. I have that set up, and I place the crate inside it. The hens are out free ranging, and the run is locked up. My set up has it so that birds can access the coop and nests from the outside. But if not, I would just place a nest near where they come in.
Then I sit down there and wait or check frequently. Once the chicks start exploring the area beyond the safety zone - I give them a mock chase, and they will retreat into the safety zone. Once they have that figured out, I quit worrying. And I let my hens back in.
Now the big thing is, the safety zone needs a lot of entrances, so that a chick cannot be trapped away from safety.
They will venture out, retreat, out retreat. I keep food in the safety zone so that they get enough to eat, and water there too. Eventually I will see them just being with the hens, and it is integrated.
Chicks will be a sub flock until they start laying, but they will be accepted and part of the flock. As to waiting until they are 6 months old, I would not worry about that either. Once they are part of the flock, they really should not have any more losses than your full grown birds have. I would let mine stay with the flock. I really don't see how you are going to let out part of the flock and not the other part. Do you have a rooster?
Mrs K