Hey @rick-0!

I don't know about all the play a song then radio business... But I also wanted to be able to play radio stations on sonos with my flics(not a playlist) and wrote some code that works for me.

https://github.com/V0idmain/flic_examples/tree/main/sonos_radio_example

You'll need to be able to get setup with the hub sdk.

Hope it helps!