Offhand, the only thing I can think of that might be worth an official release is the demo of "Love Of The Loved" from the Decca audition. Glyn Johns' four minute mix of "Dig It" from Get Back is worth having for completeness's sake, and some of the Kinfauns demos are good too, though again probably only of interest to completists.
By the way, the presence of three or four new Kinfauns demos on Anthology 3 not included on the bootleg version suggests that there may be more of these to be had.