I'm wondering if you could now achieve that same effect with an iPhone or iPad and the FaceID sensors... no good for full-size flight sims but I'm wondering if this tech is now going to get its day some time soon.
FSX has support for trackir[0] built right in. For $150 you get head tracking. It's actually quite fun and was super useful for my budding simulator hobby
https://www.youtube.com/watch?v=Jd3-eiid-Uw
It would look goofy for a copilot, but it would make a world of difference for the pilot.