OI don’t think that I can shed much more light given how the door articulates depending on what is both above and adjacent to it.
Attached is a photo showing how the door opens in my garage if there is no car adjacent. Suspension height did not seem to affect the final position. While the doors definitely extend out more in a horizontal plane, they also go up higher than your 79”. I tried suspending some heavy cardboard over the sensor at about 79” but it was ignored by the sensor.
So, I think your back to your original plan: check it out with a Model X in your own garage.
OK. Final 3 photos. They don’t improve your situation at all, in that the FWD opening is still way to small for a passenger to use. This time I stopped the door height at 79”. The first two photos the suspension is at standard height. The final photo was taken with the suspension set at very low.