Telemetry altitude data in real time has been around a long time. My A9 TX will do it. I have a Jeti with voice modulation that will tell you what it is. Real time.
That was not the original question though. Comes back to enforcement. What will the cops point at your plane to tell you you are too high? Bet the speed trap guns won't work!
This is clearly another reason not to register. I would never agree to these terms. Amazing how all of this feels like Obamacare.