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. 😬
100% done this. Some systems just gel with me better (like nWoD or CofD). I’ve always wanted to try this with Curse of Strahd.