just replying to bump this up, in the hope that someone might know how to get the zircon pump pulley assembly apart.
i now have two pumps, one with a good pump and knackered clutch. The other has a good clutch, and damage to the pulley.

85 WR quattro
90 V8 Silver, 91 V8 Black, 93 V8 Lago
93 100e quattro V6. Titan, i think