Yeah, it sounds like TB2 will be played exclusively through DMM, which doesn't allow players outside of Japan. TB1 was played through AndApp, which anyone could download/install, so it appears things are different here. From what I've read, the DMM versions of games are separate from the other versions, as in the case of GBF, where you can't carry over your account and sync the data between the two. If this is the same situation here, even if players outside of Japan could somehow manage to set up an account on the DMM version of TB2 and begin playing (to redeem their character code), the data would likely remain separate from our phone version, which makes it a no-go for me. We'll soon see if things are as they seem, but my hope is slightly lessened.
Oh well, I guess it's the classic re-rolling for me, I guess.