If the TIR stays dead, a simple webcam, an Aruco tracker and Opentrack software will do the job adequately.
An Aruco tracker is basically a printable box filled with a certain pattern that a software algorithm is able to recognize. Opentrack uses it for deriving position and rotation. So all that's needed is to print out said tracker, tape it onto a piece of cardboard and mount it to a base cap or trucker cap or anyting else that's wearable. Making it work in Opentrack is easy, but setting up game profiles can take some time (to get the curves right). The advantage of this setup is no cables and no battery pack. And provided the camera can handle it, the tracker even works with nothing but the screen as a light source. Backlighting poses a bit of a problem though.
It's the best "poor man's TrackIR" I've found (much better than Facetracknoir and completely free) and works well in FSX, DCS and Falcon BMS.
More info:
https://github.com/opentrack/opentrack/wiki
https://github.com/opentrack/opentrack/wiki/Aruco-tracker
There are also Youtube videos on the subject.