I am looking at creating a "chatter box". Set up Pi Zero W in AP mode. Maybe use long range USB WiFi adapter. Set up a conference. People connect to the Pi via WiFi and dial into the conference. Radius doesn't need to be more than 100ft.
Chatter goes on. Everybody is happy (or maybe not).
@wardmundy how many simultaneous calls do you think Pi Zero W will be able to handle?
I happened to have a couple of Zero W boards sitting around. MicroSD cards are arriving tomorrow. Was going to give it a shot. But if you say it's not worth it, I'll just wait until I can afford 3B+. Thanks for the heads up.