I find Symbaroum’s mechanics p elegant, tbh! What doesn’t work for you?
Regardless, I think @starmonkey Dark Davokar or Trophy Gold suggestions are great to use with that setting, but those will inject more survival-horror aspects than are actually in Symbaroum — not bad, by any means, but you’d certainly be playing a specific version of Symbaroum with those.
I love the resistance system designed for Spire! The toolbox mentioned by @Charles_Moore is not a system per se, however, but the means by which to create your own resistance ruleset (kind of a pedantic distinction, but I think you’d be confused if you opened it up expecting a set rules system).
I don’t think resistance is like BitD, though! It appears that way at first glance, but it’s doing something quite different than BitD. Regardless, it may fit the rules-light approach you’re looking for and you could certainly take the Resistance Toolbox and retrofit Symbaroum to a system you like!
ETA: actually, now I remember Symbaroum’s combat, which is definitely a little involved. That could use some finessing for sure.