Re: It communicates the vehicle's exact location to emergency services
"From what I understand, eCall only activates when there's been an accident, "
That's fine as long as it's an independent system and there is nothing else being transmitted when it hasn't been activated. If their is a bang severe enough to set off the airbags, chances are good that you'll need emergency services. Not 100%, but a tow at least.
It's been a couple of decades since I've worked in RF, but I've been brushing up a bit. More than just talking on my 10m rig that is. The plan was to buy a used Chevy Bolt this year, but things have put that on hold. My current car is silent as a really silent thing when it comes to broadcasting.