The exotic ore crushing does accepts Gauss modules, but that doesn't help a whole lot. I haven't got this far myself yet to really dig into it, but yeah, looks like there really aren't that many outputs worth the effort of white hole generators. I wouldn't expect beacons to affect those generators, they'd end up crazy busted strong.
I think my other balance feedback about the black / white hole generators is the research balance. It takes soooooo much research to unlock them, then there's comparatively not that much more to be done with the new tricks in the process. IMO the generator techs could cost half as much as they currently do, the subsequent techs 2x their current numbers. Even though this is an increase in total research needed, it'd shift what feels like the big research check away from the "middle" of the endgame & more appropriately towards the conclusion.