That's a tough one... I checked one of the Totos that use the unifit adapter, and (at least on the one I checked), the toilet is 28" and sits 3/4" off the wall.
Would it be at all possible to put in a pocket door? that can work wonders in a small room. They also make some that slide on the outside of the wall in case the wall in question has lots of wiring or pipes, too. A good dual track, ball-bearing track and it is a fingertip to open or close. they make locking latches for the things, too (I have one on my door to the bathroom).