P.S.
If it turns out you need it…
I just thought of a method to more easily move these three libraries in and out of play rather easily.
If my theory is correct, you could just make a couple of simple batch files for your OS that moves the files back and forth from some alternate location. Where ever you move it needs to be a directory that isn’t in a path scanned by HALion, nor the CuBase MediaBay system. Though I could be wrong, I’m pretty sure that ‘registering’ the libraries simply consists of putting a shortcut/link in the VSTSound directory (if the actual library file isn’t kept there).
On Wiondows, NTFS Filesystem junctions and Windows short cuts pointing to files are also compatible with HALion, so these can be incorporated as well if you like to keep some stuff on ‘alternate hard-drives/partitions’. I’d imagine that symbolic links also work on Macs.
I might can assist you in making such a batch file, but I’ll need to know what OS you use. If you’re on windows, I’m fairly positive I can help you. If you are on a Mac, I’ll have to do a bit of research (I’ve no clue where HALion VSTsound and VSTpreset files are kept on a Mac)…or someone that knows Mac OS and can test things might chime in and help.