I sort of did that with Rodgers & Hart. I made it a set including the stuff that was on the Complete Recordings, the alternate mixes from the 1987 "Rodgers & Hart Collection" CD [[which remixed the 12 album tracks, the rest were the same as on "Complete..."). As well as a couple of the alternate mixes and mono mixes that appeared on various collections and anthologies. Though a comprehensive set as you described would be more than welcome.