Hello focuspuller,
This may be a long shot, but in doing research for my site, I stumbled upon the track listing for a very rare BR bootleg called Cliffhanger and Radio Plays, and apparently one of the tracks ("Stalking Pris") just might contain the music cue in its clean entirety for when Deckard walks up the stairs to J.F. Sebastian's apartment.
Just wanted to give you a heads-up, in case you missed it.
Hmm, as a matter of fact, I would be interested in getting this bootleg too... ;-)