@davew If a podcast doesn't have an RSS/ATOM feed, it's just a Sparkling MP3.
Meantime, I reminded myself last week of a writer who had self-published his work as a podcast, searched for his name (it was https://mastodon.social/@ScottSigler) in my podcast app and within 10 mins I was listening to his "Infected" saga for the first time in more than 15 years.