I still think that's not good enough, that treating them fairly is a stupid waste of time and resources and unfair to everyone else.
Just make the rule "any slop" and give the idiots a checkbox so they can ban themselves for reasons which will never be revealed to them (sloppers don't read documents, it'll take them a while to figure out). Also start banning people when evidence surfaces of them admitting to slopping.
I don't like this concept that a slopper can potentially produce decent code, the data shows this simply isn't true: sloppers produce vast amounts more and worse bugs and vulnerabilities. It's better for the health of the project to ban it in every scenario.