I'll just leave an idea here that does not look really feasible, but hell, I might as well mention it
Chastity cages (
this resource) are a bitch to get looking right. The penis shaft is the simplest to fix, you just shrink it with morphs and avoid movement of the bones, but the testicles always look terrible for me. You can use the morph of the resource to avoid the clipping with the chastity cage's ring, but it doesn't look right at all, especially with physics.
Perhaps eventually this plugin could be used to make setting up chastity cages less of a chore? I'm not knowledgeable about this, but I'm guessing that it would take a lot of morph wizardry and CUA engineering for a good result. It could also be outside the scope of the plugin. Still, I'll just leave this here in case there's at least something salvageable from the whole thing.