Just the address of your first place of stay would be ok.
You don’t need a return or onward ticket for a Non O visa. A non O is not multiple entry. You’d need a re-entry permit if you wish to leave before the 90 days to keep your current stamp date valid.
Not sure where you read information on the Non OA / OX but they are multiple entry visas and don’t require re-entry permits for the duration of the visa.
Yes you can do in branch. It’s all about the app and face recognition. As foreigners don’t have access to the face recognition system (no idea why) then they limit transfers out of you account.
In person at a branch with a passport you can do what you like.