If the PG CAS folks would work with the IPSC guys, you could get a good thing going by promoting the SASS 'Wild Bunch' class. This lets you use 1911s, '97s and they just approved Win M12s as well. Right now, the Victoria club is the only club in BC doing this.
If we get it going here in Quesnel, we'd admit any period gun from the turn of the century - Mauser Broomhandles, Lugers, Colt New Service, etc. If they need hardball ammo, no problem by offering a mix of steel and paper targets. Of course, the usual CAS revolvers, carbines and SxS's are in.
The rules require a 1911 (any auto loader) to have 5 rds in the mags, hammer down on an empty chamber. Exposed trigger guards are OK as a result. I shot one of my 1911s in a CAS stage and in the time it took to rack the slide to chamber a round, the single action shooters were already on their second shot. And shooting a 1911 'Duelist' with a 200/230 gr bullet is a far cry from "Pop-pop-pop'' using two hands with a wimp CAS load.
Download "Wild Bunch For Dummies" for the complete rules. They've got it all worked out.