Someone in another thread or some youtube comment section mentioned using a Hanging Brazier for those worried about chickens dying from a fire placed on the ground.

I haven't come across chickens phasing out of walls yet since I used the hoe to make a small enclosure near the Forsaken spot amidst my veggie farm and tree farm.

edit: Also if someone needs eggs due to difficulties with dying chickens let me know and I'll give you a few. That or just use console commands I suppose to spawn them.