If the game supports 6DOF in TrackIR then it is pretty simple to use GlovePIE to make it use the rotation from the VR920 but the position of the TrackIR:

FakeTrackIR.Yaw = VR920.Yaw

FakeTrackIR.Roll = VR920.Pitch

FakeTrackIR.Roll = VR920.Roll

FakeTrackIR.x = RealTrackIR.x

FakeTrackIR.y = RealTrackIR.y

FakeTrackIR.z = RealTrackIR.z

If the game doesn't support 6DOF TrackIR, then it will be more difficult. You will need to emulate the move keys and the mouse look based on the VR920 and TrackIR. Or possibly emulate the joystick. You can do these things in GlovePIE too, although it is more work.