To start with we now have the Norwegian example of a clearly better way. Yet there are also far too many in the system to the point that it is clearly a racket.
My own thought is to simply create natural communities of 150 persons that is self governing. These can be placed anywhere, but is the case of high risk they can be paced out of harms way. All these communities can be tasked with forest grooming in particular. It is not hard to measure results and adjust accordingly. It is not hard for inmates to judge a buddies efforts and reward accordingly.
It is not going to halt violence but it removes the participation of overseers..