I don’t know much about MSFS plugin system so I don’t know if this is possible but you can easily extract data from X-Plane and then send over to MSFS. So that you use XP as physic and model engine, only MSFS as out-the-window view.

Basic things like latitude/longitude/altitude/heading should be straightforward. But then you might have problems with mismatch scenery, like missing airports/runway, different terrain heights, etc. And then the weather synchronization is another can of worms. Matching what you see with the physic model can be challenging.