IIRC correctly, one of the recent Smith & Wesson Invitationals also had an interesting stage that required you to use an "opposite" handgun to shoot part of an IDPA-style course through a shoot house; there was a dummy placed partway through the house that had a revolver (if you were shooting a semi) or a semi (if you were shooting a revolver) laying next to it, and you had to use that gun to complete the course of fire. This runs afoul of IPSC rules, but I think it would be an interesting challenge and a change from the "run up and blow the patches off"-style of match.