(Solved) Two of the *same* USB DACs on one DietPi SBC?

Many of us have discovered the wondrous efficiency of running two or more USB DACs on the same DietPi SBC. I consider this a minor miracle that it works at all, but I have run into one small limitation: Apparently Roon does not recognize two USB DACs on the same Pi if they are the same brand (or perhaps it’s if they use the same USB receiver chip.) Is there a way to differentiate two DACs in DietPi so that Roon will see them as two different zones?

Some combination of unplugging and plugging various DACs and updating DietPi to the latest version seems to have resolved the issue!