The problem with most of the tracks you mention is that fact they were released on the box set, and they wanted that to be the only place to get them, so adding them to the albums was a no no.

Ideally I would prefer some standalone albums of rarities.
A rarity set 1969-1973 could mop up all the demos, giveaways and unreleased songs from a truly productive time at Haddon Hall.
A second set 1974 -76 could cover the 'LA' years, this could include some of the Bowie/Buckmaster sessions for the TWFTE aborted soundtrack.
Then a retrospective of the Low-Scary monsters period, Including the stuff which Bowie has promised on and off for years.
Next a set from the 80s, with the significant demos of tracks from Tonight and NLMD which Bowie insists are better than the finished tracks. Also this could include the aborted solo sessions from 1988
Tin Machine are bound to have some treats which were never released, the original You've been around, Sorry (fast version), Debaser, Go Now, Maggie's farm and of course NOW.
A 90s retrospective of sessions from BTWN, Earthling, (inc fun, BKS,etc) and hours.
Outside should of course have it's own unique set.
00's include Toy, Your turn to drive, Mother and various bits he has done in collaboration with others.


I haven't got a signature at the moment.