For X3 and openTrack, i confirm what Ralph said, and it works pretty well. (without any particular configuration, i just put my vive on input and reverse pitch in options. I did Nothing more). I have already played about 30 hours in X3 with vorpx and it is very good even if it is not geometry (i played i think 650 hours in X REbirth VR, so i think i am for a big adventure in X3).
Just for those who want to play X3 with vorpx, personnaly i play with a resolution with 1920 x 1080, i play full screen to enable anti aliasing. Full VR works good, but i prefer to use immersive scren (which works as good as full VR) so you avoid to click on the middle mouse button to see the options on the left. Of couse it is possible that there could have better settings, but for me it is more than sufficient.
Perhaps one day Ralf will find a solution for X4 or we will need to wait at least 2 years before seeing a X4 VR from egosoft i think.