nostr:npub1sz73fy4szmsxrv025tav4h0jav6qp3qz4z9l4edgefr9sr7a38nqrmew6a 

Probably keep using Overcast for those podcasts assuming it works for them. They aren't using any new podcasting2.0 features anyways. 

Then get a second (and maybe third) app for trying out podcasts that support the new stuff. Luckily today's phones have plenty of storage space for apps

https://podcastindex.org/apps?appTypes=podcast+player&platforms=iOS