I seem to do this a lot - I’ll find a game whose setting I really like, but dislike the ruleset it uses, so I end up converting it over to the ruleset I prefer (usually Cypher System). I’ve learned that to some people, this is blasphemy of the highest order, which is surprising. I still do it, though. 😬
I love mage, but its magic is so involved and powerful I wouldn’t want to use it in a game unless everyone was a mage. You don’t really want one players options to be “I hit him with my club” and the others to be boundless.
Awakening 2nd edition was really good, imo, but I never actually got to play Ascension