In my experience, mescaline is one of the kinder, gentler psychs. Sure, you have stomach distress, but mentally I consider it to be babby's first psychedelic. It's fun and worth trying, but don't expect it to be a mindfuck.
If you want to get into mescaline analouges, try hunting for the TMA-*'s. Stuff like TMA-2 was easy to come by in the early 2000's, but not so much now unless you synth it yourself or know a chemist who's interested in phenethylamines. Maybe you can find some at a DNM, I dunno.
In terms of the ones currently on the market like methallylescaline/allylescaline, I can say both are a waste of time. They not only lack the corpus of mescaline, but there's a ceiling where taking more doesn't do much.