It looks like Mark Thomas maintained a phone number database up until 2007 or 2023 for many areas in the USA. I guess that could be a basis for starting 'my own' instance of payphone-go, maybe with twilio (or equivalent) to receive the calls.

[0] https://www.payphone-project.com/numbers/usa/ going through the state map feature only shows a subset compared to navigating through the links on this page.