Is it possible to become a real celestrian again

You probably can. By the use of some Action Replay code that i'm not aware of, you could probably get your wings and halo back. There is a Halo replica hat that you can get from a quest. I think even in very rare cases, it can be even be found in the Protectorate by breaking clay pots, barrels, opening dressers, etc. But as for the wings, i'm sorry. Unless you use an Action Replay cheat, it is impossible.