I think they did that in the old time US. It wasn't necessary to hit the poor hen or capon with twigs. They just took the baby chicks at night from the hen and put the baby chicks under the capon.
This type of old-timers also sometimes kept game hens as their broodies if they didn't have any capons. They would put standard-breed eggs under the Game hens. That is a similar idea to keeping some feral Hawaiian hens as broodies.
I wouldn't trust feral hens with chicks. One day you will find them all roosting together on a tree two blocks away.