Dunno why Jimmy hasn’t released it on CD. I’d speculate that this must have been addressed by him at some point - the elephant in the room, kinda thing.
I don’t pretend to know much about master tapes - but there must be two - the RL one and also the one that was released generally.
Given that the RL creation was "hot" it may present certain technical challenges, dunno. As if that should be any issue these days.