Somewhere else I proposed the AMA should set aside the bottom 10 channels for Freq Conflict, let all the PFs have the bottom 10 channels & shootdown each other.

I dont see why that wouldnt aply here too.
Bartenders can refuse to serve a drunk under the name of Public Safety, so shop owners can simply ask for the AMA card to sell other than the bottom 10 channels to guys. Same high quality equipment, same features, just in the Chaos Channels of our plane band. Not a goverment act, just storeowners chosing to help prevent shootdowns, they dont even miss out on selling a $300 radio to some guy that needs a WallyToy- they can sell the most expensive radio they have but just in a channel "1_"

Would it be a perfect system incapable of letting a stray TX or two fall into PF hands?
Heck no.
But it would cull out 95% of the PF TX chaos on the freqs we use
(we just use them, they are not our freqs even when standing on AMA land)