I have reared many goslings under a hen... might be tricky with a bantam though if she is small. I always used large hens and they would take up to 5 quite happily! Goslings are very easy to hand-rear and become very tame, you just need a heat lamp and the correct starter food... they also love greens
No heat lamp, surely as they're under a hen. I'm presuming that you're going to let the bantams rear them, in which case, as mentioned, get some starter feed for them, which the hens can eat as well, and the hens will do the rest for you.