That’s kind of what the SoCal F100 series tried doing. You could run a KT, KPV, or HPV engine with a variety of exhausts and the BoP was weight. Their rules even allowed for TaG engines to run in the same class with a restrictor and a heavy weight. We modeled our rules after that but just for piston port. I think down south they have been finding some success with KA/KPV/KT but I don’t know specifics. We ran with the KAs at our first club race because there were only 2 KAs.