I am holding out against an incubator for now. We have 3 left we got from a guy in Sac (they are breeders birds and his hens hatched them out)-- including my flock Roo ( I really want to post pics but am not tech savvy- he is just really feathered out and big, almost plump ish)-- so unfortuantly the 2 hens mostly likely to be broody ( they are really huge as well, and larger then the 7 hatchery birds) are his sisters...But I guess they can brood other hens eggs as well so we will see (these are our first chickens have no idea how to facilitate hatching out chicks, except that the big birds have taken to laying in a large dog kennel we have stored under our porch-- I think its hard for them to get up in our nest boxes they are really heavy birds)....
If you want to try and trigger a broody - put a bunch of golf balls in a nest for them. Sometimes lots of egg shaped things in a nest will trigger the "broody" instinct in hens. It doesn't work for my EE (Americaunas) from the hatcheries though, broodiness has been bred out of them. Other than that - once they do go broody let them do their job. There is a really good thread on broody hens.. I haven't read much of it.. yet.. https://www.backyardchickens.com/t/...ody-hen-hatch-a-long-and-informational-thread
Good Luck! I bought oddball birds to try and get broodies - and so far a Silkie and a Silver Phoenix have obliged me!