I've done the bonk method with quail. You don't whack them hard enough to kill them, just enough to stun them. Makes life MUCH easier when butchering quail. I plan to do similar with the chickens. I hope that I can just walk up to them and smack them in the back of the head with a piece of rebar, then hang and cut. I'll probably be hanging them with clothesline from a tree branch.