SE haven't indicated whether cross-region transfers will be possible so there's no way of knowing if this may become an option for you. You may well have ended up on a JP server because all NA/EU servers were locked at the time you created this character.

As Dhampir2 says, each new toon you have gets their own toys so that's not a problem, what might be a problem is that last time I saw all NA/EU Legacy servers are locked for character creation with no end in sight, while others in the server farm get locked and unlocked from time to time.