Winning proposal:
Once Derek Chauvin has been found guilty in a court of law, he is sentenced to a term of community service of a length and type appropriate to the severity of his crime. (So in this case, a lot. Life?) That community service is overseen by agents of the court; I’m thinking more like lawyers or clerks, less like armed bailiffs. Those agents are not charged with forcing him to stick to the community service, but rather just observing whether he does so.
If he forfeits on his community service, as determined by the courts, then he will be considered an “outlaw” - meaning, specifically, someone not protected by the law. Anything done to him that would ordinarily constitute a crime no longer does. No police are necessary; if he refuses to serve his time helping his fellow man, then anybody with a chip on their shoulder can punish him for it. As long as he sticks to his sentence, he’s safe, with his life dedicated to helping others. And if anyone were to commit a crime against him while he was in that situation they would face the same fate he currently faces—an appropriate community service sentence enforced by the threat of being put outside of the protection of the law should he violate that sentence.
Obviously, it’s crucial that the courts are seen as impartial and unimpeachable, since they don’t have a bunch of men with guns to enforce their will. But it’s the best I’ve got. Derek broke the social contract; either he makes amends or we’ll put him outside of the protection of that social contract. Simple as that.