Will this keep people from the running RC4 client but forcing the % paid to 1% or 0%? If it can handle that attack vector then that idea is fine.
IMO, even if the compliance is fine now, as DRK increases in adoption and the marketcap goes up the malicious WILL attack.
This is inevitable and we need a bulletproof solution. If DRK comes out as the #1 anonymous coin while having a shoddy enforcement solution, other coins could easily take that place by attacking masternode payments.