However, a very similar lean-Linux distribution for Raspberry Pi called Volumio, does have a working Radio Paradise plug-in right now that allows streaming their 16-bit/44.1kHz (CD-quality) FLAC channel on a Raspberry Pi!
Apparently this feature has been available in Volumio since sometime in May but has largely flown under the radar.
I won't say it's been 100% perfect for me, sometimes playback just stops and has to be restarted, though veteran internet radio enthusiasts might indicate thats nothing too surprising or unique.
After downloading and installing Volumio 2.4 onto a microSD card and booting it on a Raspberry Pi3b+, it was a simple click to install and activate the Radio Paradise plug-in:
Then a look at the Browse tab for music sources reveals Radio Paradise with it's own badge/icon, fully separate of the other "Web Radio" stations:
Clicking the RP option above gives a choice of various different quality streams, including the lossless one:
Click that FLAC stream from the list and...
I will keep Volumio on one of my Raspberry Pi units for this feature alone. Radio Paradise is really great when you need someone else besides you to be the eclectic DJ, while you chill out in an easy chair.
Beyond very highly recommended!