If you are use an iphone or ipad, I would use airplay to play the content on Sonos.  You could also use a Roam and share a bluetooth connection between phone and Sonos speakers.

As far as Sonos speakers being able to play Uni radio content directly, I assume you are using this method.  I am not really that familiar with this so can’t tell you if it would work for a preset recording as well as radio.

As far as Sonos adding the feature, Sonos has an open API that any music service can use to allow Sonos speakers to play their content.  The service provider is responsible for coding the service through the API, not Sonos. Playing saved content through the API certainly is possibly, as I’ve used it with sirius/xm.  I can’t imagine Sonos would put up the money needed for your radio station to do the work, particularly since Sonos is running their own radio station these days.

I might talk to the university station about it.  Perhaps it would be a good student project?  Don’t know.

Also, just looked at this page, and it might be worth seeing if you can access through Apple music (not sure if you can access podcasts there, don’t use Apple) or through Spotify.

Thanks for the reply. I did try some of the suggestions but no luck. I’ll try reach out to the Radio Station but not holding out hope. This can’t be the only radio station that does this so hoping SONOS may come up with a solution at some point.