I read it "upside down" at first, just like Mac.

The easiest way to think of the chord is that it is Cmaj13--
1 C
3 E
5 G
Maj7 B
9 D
11 F
13 A
--but you are not playing the 11. It's not a big deal, though, because including the 11 or even a sharp 11 doesn't change the chord much.
Try putting the Cmaj13 or Cmaj13#11 in as the final chord and have BIAB hold it. You'll probably be satisfied right off. If not, try Cmaj13/B.
I guess the other choice is to wait until you mix the song and force a midi guitar to play the notes you want.