Yes, you could do something like that. I think when it comes to a disaster situation when the cellphone towers might be down, that's probably one of the best options. I still think that, in situations where you can use infrastructure, that's definitely going to be the best. This is a good alternative if there is no option like it.
For example, in California when the wildfires were spreading so fast that they were was taking down the cellphone towers faster than people could get the warning messages, that might be a situation where something like this might be useful.