Hi,
you can do this with Point Set Registration. It is a little to much to descirbe it here in the forum but you will find a lot of example code like:
Point Set Registration Methods — Discussion and Implementation | by Anupama Rajkumar | The Startup |...
At least you need three trackers (if you use just the tracker position) on your physical model and the mounted positions also in virtual/tracking space. Then you can do the alignment and match physical and virtual world by applying the transformation matrix, you get from the registration algorithm, either to the VRED camera or the virtual model in your scene.
You can implement all of this directly in VRED but of course, you need to code quite a lot.
Hope this helps you a little bit,
best regards,
Christian