I know Unity game engine uses some transpiler called IL2CPP that manages to preserve some of the safety features of C# but still gets the speed of CPP, so one direction is definitely possible
Oh, it's mainly for platform compatibility. IL2CPP performance is really problematic since it still carries many issues of Mono, even if transpiled to C++: https://meetemq.com/2023/09/18/is-net-8-performant-enough/ (don't look at just the starting graph - make sure to scroll down to notes where RyuJITs code competes with other fast entries or even outperforms them).
Perhaps what you were looking for is NativeAOT? Either way C ports really well to C# since it supports a large subset of it "as is" and then some with generics and other features originating from C# itself.
