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I recently posted https://steamcommunity.com/discussions/forum/10/4406292251594332846/
Using that you could add e.g. a flag "NVME" to a game when moving it there (and remove it again when moving back) and have when selected for sort/display a library category "NVME" that'd hold only your so self-defined "really ready to play" games. "Hiding" the rest is then a matter of ignoring said rest...
Not a perfect fit I guess if you already extensively use library categories and like those for primary sorting of your library -- but for what it's worth. Can't think of currently available method that'd make things truly convenient.
As opposed to moving the HDD library as you do now; isn't it less trouble to remove the HDD library from your Steam install outright and just add it back when you need it to be back?
But as far as I'm aware there's no other convenient way to "hide" a library, no.
Hence why i now rename the folder each time just to not have all those games show up each time.
So, "can't reproduce".
But behold it works now !
Thanks :D