How do you think Zoro would have fared if he instead had to go to Amazon Lily for 2 years? He's probably immune to Hancock's powers
He'd turn into Asura again if they tried to put a frilly outfit on him like they did Luffy.
But Zoro's as man as you can get, he's not as ambiguous about it as Luffy is (he wouldn't be able to get away with being a "flat-chested girl"). He wouldn't be able to get any type of training really, though he'd be able to learn Haki from them if he was able to pass off as a woman. He'd probably yell at them a lot for being sexists, and he'd end up on their bad side. This would result in him dying by excessive Snoo Snoo.