Any mods or ways to stop random townies from using certain skin tones?

I'm going to second Sims 4 Studio. The batch fixes are really easy to use and it backs up your files so you can put them back if something goes wrong. It's also pretty easy to edit individual CC files. The site also has a bunch of tutorials. I know it's not as easy as dropping in a mod but it's not terribly difficult. It also allows you to enable CC for vampires and aliens that isn't otherwise available to them.