I noticed this:
"Any .17 or .22 caliber rimfire rifle; "
... and there are these:
F17 Series | Gas Piston AR | Rimfire Rifle | .17 WSM
The F17 series is the world's first gas piston AR rimrifle. Our firearm F17 of semi-automatic rimfire rifles were designed with safety and efficiency in mind. .17 WSMfranklinarmory.com
Is there anything preventing someone from coming up with a bigger .17 rimfire caliber, or a corresponding .22 caliber rimfire; and the rifles to accept them?
Or simply go to a shop, buy yourself a stripped lower, order an upper of your choice or parts to build same, and make yourself whatever you want? If you want to be real paranoid have a .22lr upper laying around and register it as a .22lr before putting whatever the hell you want on it. Stay within the bounds of actual law (Not too many evil features, no pistols over 50 oz. etc.) and live your life, random pronouncements from idiot bureaucrats are not law.