Radio Paradise is still a FLAC stream, at least in the Windows version. If it isn't in the Id Pi, and is AAC 320, check in the Windows version if you have one set up, since you have the licences. A lots has changed, a lot improved, in Streaming since MC24. It still isn't perfect but works better in MC26. Maybe the Id Pi version is for some reason accessing the AAC 320 stream. Maybe that is all it can play, although I would expect to it play native FLAC files. Maybe that needs to be fixed.
Panel has access to JRiver Radio and whatever has been added as "Car Radio" Buttons, which can include Playlists, streams etc.
JRemote2 has access JRiver Radio and Cloudplay, plus any URLs you have in MC, perhaps in a Playlist. It doesn't have a separate Streaming section at the moment.
I just Googled "FLAC Stream URL Radio Paradise" and came up with the Radio Paradise page that shows all their streaming links:
https://radioparadise.com/listen/stream-links. From that list, the Main channel FLAC stream URL is:
https://stream.radioparadise.com/flac That couldn't be more obvious could it!
I use MC's "Open URL" function to open that URL, and it played Radio Paradise in 16/44.1 FLAC. Unfortunately, it doesn't have the metadata to tell you what all the tracks are, like using the Streaming menu in the Windows version of MC does. But it plays fine, you can add it to a Playlist, and you can add the Playlist to a Car Radio button. I tried to play that Car Radio button in Panel, and it didn't work, and neither did playing the Playlist directly. So something is going on there. The Playlist did play in JRemote2 though, in 16/44.1 FLAC.
So, some good news, some not so good. JRiver are still working on the Streaming functionality in all Apps.
Mike, you must be having a bad day. Aren't we all, stuck at home. Unfortunately not all, or even many, threads get responses from JRiver staff.