Hi Alan,
A rich list, adding to the already overflowing pool of podcasts. I like to listen to a range of non-Edu podcasts. Even with two 40 minute plus commutes every day I still can’t get through much. Like you I really only listen to podcasts while driving. There are a couple of things that I find useful.
Castro, is a podcasting app that lets you sub to many podcasts but triage the ones you want to hear into you “queue”.
The other is Huffduffer, this is a bookmarklet that will pull individual episodes into your own RSS feed which you can then sub to. It will even rip YouTube videos to audio and host the mp3 for 30 days. https://huffduffer.com/johnjohnston is mine. Now I am off to huffduff some of your suggestions:-)