2025 Buick Enclave - Connect to External HotSpot, will Onstar work?

I am extremely mad that my brand new car, which I specifically bought for our long drive across country no longer has functioning OnStar.   I bought this car because of all the safety features for the long drive because my son is autistic, and I want him to be able to just push the SOS button and ask for help and not have to know where he is.  Onstar could just find him.   But now I have apparently been caught in the issue that is happening with the telemetry/onstar module failing and there is no replacements that are available.   Again, I am beyond mad.  It's been in the shop a week, and there is nothing they can do.   

At this point I am trying to look for a work around.   If I get a external mobile hotspot and hook the car to it, will the On Star work via that hotspot, so if my son needs help he can get it.