First of all, there are only 4 Deccas (New York, New York; At the Five Spot; In Kansas City; Jazz in the Space Age)-- not enough for a Select. Secondly, all with the exception of In KC have been released domestically.
There is more than enough material left over from the "KC" sessions to fill out a good Select.
If Mosaic did it, I'd buy it.
So would I, but if Universal's Hip-O label did it, I'd have to hear it first, given my mixed experiences with the sound on their sets.