Iluveggers
Enabler
I would suggest a bantam variety. Most bantams go broody fairly easily, and often do well ranging because they are small and can fly/move quickly.But those are definitely the most important traits, a bird that goes broody really easily. The other traits I have listed them from most to least important (apart from hardiness, but that I also clarify it with free ranging ability as they won't be able to survive for long)