Not OSS, but you could self-host Foundry that would allow for that. There’s a lot of plugins for different TTRPG systems

The media import is nice. That’s why I haven’t switched either.

I half expected this post ending with HA turning itself off

Check out newpipe

Marketing. That’s Apple.

For you or others who are curious and want to do this:

AntennaPod settings > User Interface > Set playback buttons.

You can decide what shows up in your notification on your lock screen.

Also make sure to toggle Persistent Playback Controls on.