Thanfully, you don't need to write p/invoke stuff yourself anymore. https://github.com/microsoft/cswin32 creates methods and all related structs for you. It's also AOT compatible (if you specify it). It works for calling C and COM functions.

I mean, not like this brings Windows development anywhere close to "modern", if anything, it feels like you're moving into the opposite direction, but at least this solves the "The modern APIs don't provide the specific functionality I need" problem that plagues all of Microsoft's "nice", "modern" abstractions…