Obviously you'd have to have the emails of both accounts to be able to do a transfer, or at least proof that the account is yours. Plus they'd have to be the same gender and allegiance to protect the account from being stolen. Seems like a messy business to run from the GMs side but something I would like to see as my characters are spread across multiple accounts. Maybe through a GM Service?
Hercules 97 High Priest
Shepard 99 Whitesmith
Hawk 98 Clown
Barossa 97 Professor