Is there a reason you’re not considering running this in a VM?
I could see a case where you go for a native install on a virtual machine, attach a virtual disk to isolate your library from the rest of the filesystem, and then move that around (or just straight up mount that directory in the container) as needed.
That way you can back up your library separately from your JF server implementation and go hog wild.
It’s been my most used feature on my Garmin Instinct 2X tbh. Glad I don’t have to carry a separate gadget.