> Built as part of an attempt at [...] having overseas content on the radio dial

Old radios have the station locations (cities all over the world) as labels for the tuner: https://www.radioheritage.com/story354/

Or: https://www.shutterstock.com/image-photo/european-cities-rad...?

A further (well, different) hack would be to combine this hardware dial with stream URLs e.g. from https://radio.garden/ ...