Now, I know there is a Chinese version of FFXIV. I also know that there is a Chinese data center that is separate from those of the rest of the world.

What I am hoping to find out is, for my Taiwanese girlfriend, would it be somehow possible to have a Chinese language client and still play on the Japanese servers (so she could potentially join me if she decides she likes the game)?

While she can read and speak both English and Japanese to some degree, I know she would be much more comfortable if she had a traditional Chinese client translation. In the event that this isn't possible would the reverse be? (playing on Chinese servers with an English language client? Do the Chinese servers even allow log in from Taiwan? There's a weird political situation here in that regard. >.>; )