I suggest if you want to get them used to it you could maybe put treats or food in it, then at night, to get them in, you could lift them in, and they will get used to it...
Cool!
What I do with broody hens is just put eggs under her all from like, the day you move her to a secluded area. If you don't move her, you might want to mark the eggs she is sitting on in case another hen kicks her off for a bit to lay an egg (since the broody hens I've had all sit on eggs...