[Question] Authenticator questions [Android app]

[Omnia]

So rather than just ask the question, ill tell you what I'm trying to accomplish. What i want to do be able to change the Serial, or key rather, of the battle.net authenticator app on the android OS. I have two accounts added to my battle.net and i want to share the other one i don't use with my friend (who wants his lvl 80 pally thats also on it) but still have an authenticator on the account for security reasons. And since we both have android phones, and no longer live in the same state, we would like our two apps to sync so we can both log on, to just different accounts. So how can i export the key out of one and modify another?

I realize this is a very specific question and probably wont get answered, but i've been searching the internet for the past few hours trying to figure it out and thought id try my luck asking here.

EDIT: Resolved