My 2 cents.
I've had two VR headsets over the years but decided a few years ago they aren't for me. I like the head tracking and visual effects therein but the resolution and loss seeing external devices weighed too heavily against them. I've tried my brothers Pimax with his RTX 4090 and while the resolution is great the other issues still make it not worthwhile for me.
I recently bought a Tobii Eye Tracker 5. The head tracking in that is not as solid as TrackIR for me but the eye tracking made up for it. This would have been a solid replacement for TrackIR but for one show stopping issue. Helmet Mounted Displays used in DCS. HMDs therein always move the center of focus to the center of the screen. Tobii eye tracking does not. That makes the Tobii eye tracking unusable for HMDs in DCS. Tobii support could not help with this. The Tobii head tracking would be fine for this but by itself not as good as TrackIR. So, back to TrackIR for me.
If you only play games that do not require the eye tracking to move the point you are looking at to the center of the screen then I can recommend the Tobii Eye Tracker 5 for you over TrackIR.