The only thing I can think of is to start with the districts we have and then produce an algorithm that uses a random number generator to redraw lines. The algo

The only thing I can think of is to start with the districts we have and then produce an algorithm that uses a random number generator to redraw lines. The algorithm can fuzz the current boundaries making a district larger or smaller or it can choose to split a district or combine two districts. Just keep randomizing the districting for each election starting with the output of the last time it was randomly fuzzed. Sometimes the randomness will work in favor of one party, sometimes against it. In the long term, it adds in some non-partisan non-determinism, which is probably good for justice long-term. This sidesteps the question of values entirely.