A quick update for anyone going for the afore-mentioned work-around of renaming plugins via the vst3plugins.xml.
Afterall, this is NOT update-compatible with Fabfilter Plugins! I just updated all FF plugs whereupon Cubase didn’t find them anymore. What I probably should have done before updating, is reverting the plugin names to their default ones so the FF-installer can replace the plugin-paths, and not create double references in the XML which happened in my case.
I ended up un- & re-installing FF plugs and renaming them, and now everything is working again. A tedious process all in all, though. Hence it would really be great if Steinberg would implement this in the near future.