Yeah, I use Stylish mainly because I already have about 10 scripts that I’d have to move to any new system. It lets you share your script to userstyle.org but it’s a terrible UX. Tediously utilitarian to look at, but AMAZINGLY horrible to use.
At one point it warned me about a scope issue, and showed me a link to a github page to read about how to fix it – without actually linking that URL text!?! Google account oauth fails. I tried for 10 minutes to upload Molly Guard but ended up walking away.
Someone did point out Stylebot and it does look quite good. Its basic mode has properties panel which you could teach most kids to use. The advanced mode lets you write straight CSS (all I want personally) but lets you share (or at least backup) your script to stylebot.me.
Took me about 30 seconds to upload molly guard there, and seems to have a pretty active community too.