So, a broody can raise a group of chicks in the flock? The littles won't get beaten up?
Chickens have been doing that for thousands of years. Chickens have worked out how to live together and raise new flock members. A lot of these ways depend on the weaker running away or avoiding the stronger, so they need room to run away and avoid. I think most of the horror stories told on this forum related to integration or a broody are because of a lack of space.
But a good broody mother is something to behold when her babies are threatened. She still needs some room to work, but a good broody takes care of her babies.
There is another great myth in this forum. That is the myth that the other adults lay in wait and actively try to kill all new chicks. What a load of rubbish. Not all broodies are good, not all hens are good, and not all roosters are good. They are living animals kept in different conditions, but I have never seen a mature rooster threaten chicks in any way. I have seen mature roosters help a broody take care of her chicks.
If a young chick gets in its personal space, a more mature chicken is likely to peck it to tell it who is dominant. But if that chick does not get into that hen's personal space, that generally does not happen. And usually when that happens the chick runs away and all is well.
It is possible that if a chick gets separated from the broody to where the broody cannot protect it, the others might kill it. But if the broody can get to it to protect it, that does not happen.
Let me tell about something I’ve seen several times. A two week old chick leaves the broody’s protection and stands beside the adult hens at the feeder, eating away with them. Sometimes those hens totally ignore that chick, but usually it doesn’t take too long for one to peck it to remind it that it does not rank high enough in the pecking order to eat with its betters. That chick runs as fast as its little legs can carry it with wings flapping and furious peeping to the broody. The broody ignores all this. That chick should not have left her protection and just learned a lesson. But if the hen that pecked the chick starts to follow, the broody gets all kinds of upset with that hen.
Can a broody raise chicks with the flock? It’s been done that way for thousands of years.