From what I can tell, it seems likely that the bassplayer for Dexys at that time was Giorgio Kilkenny.  It also appears that he was in the band for a relatively short period of time, and I found no indication that he has been on any other recordings by Dexys or any other group.

Thanks David!
The quest is long and hard, but This may be the nearest link .
If I could only figure out how to contact this guy??