Your proposal might seem crazy, but we've actually been able to do this before. While learning WebXR not long ago and looking for examples, I discovered it was based on OpenXR (1) and literally every big tech company has APIs that were similar - I ended up reading docs and sample code from Android, C#, and even Apple to get a better idea of how things were wired together. It was a very pleasant surprise!!

1) https://en.m.wikipedia.org/wiki/OpenXR