I have been banned, but I am reformed.

If you have been permanently banned then no, there is no way to get your account back. Permanent bans are only overturned if they have been applied in error. Sorry I can't bring better news.

no. (unless it wasn't even a permeban in the first place)

If perm banned, then no.

You would need to make a whole new account and level it up again.

Sorry. Best of luck on the Rift!