I would say it's down to the individual club's discrection isnt it? I have a share in a plane, and I did use it for IMCr and other training. We made sure that the insurance policy had a provision for the club's instructors. Of course, the plane must have reliable and complete avionics to do the training.
At the moment, I am using a club aircraft to revalidate my IMCr because my plane now has an unreliable ADF box :-( , but it does has a lovely Garmin GNS430. Not sure if this is a discretionary option at clubs, but I dont see why I cant use the Garmin for holds, and do a vectored and ILS procedure for my revalidation, or even get some instruction on how to fly a GPS approach, which seems to be popping up in a few places now. There still seems to be a fixation on NDB's in this country
.