> Swift could access compiled files with these "module map" things
That's been the case since it was released – all Swift C / ObjC interop happens at the "module" level. You write a Clang module map (if you're not using a system library which already has one), point the map at the relevant header(s), then you can import that module into your Swift code.
That said, not everything is capable of being imported (variadics, complex macros, VLA structs, and a few others).
