I like that Avant-2 that fmugur posted above. Might be worth the wait, I agree. I have many other to-do's on this X, before I start down this path.
From what I've seen, none of them deal with the OBC and people mount them in the glove box to retain the functions. Mine doesn't have it (I wish it did as my other car has it) so it's an easy call for me. Plus, with unlocking the OBC, I can get to the same data - just not as nicely