Hey, never seen you around so cassy is new to me
If you want a male house trained gander I'd advise you to stay away from the heavy breeds such as Embden, African and Toulouse because they are massive.
A Sebbie gander would actually be perfect because they are small and gentle.
Chinese are the best house pets apparently but that's only if the male has no females and if you want cute babies, Chinese goslings aren't the prettiest 😂
Pilgrim ganders are gentle.
Tbh any gander that is small and well tempered will do.
Sebbies (Sebastopol) would be my choice.
Hope it helped