No objections to this feature request, but, FWIW, I’ve had pretty good luck with doing most of what is outlined here on the functional needs with Waves StudioVerse Audio Effects.
The key thing that it probably couldn’t cover on the functional side is embedding modulators within a preset. You also can’t just hover over the plugin and have it show you what’s inside – you need to open up the plugin instance to do that. It also wouldn’t be able to use Cubase’s plugins that don’t conform to the VST3 standard, which is, in my view, a limitation of Cubase’s plugins more than the third-party plugin-hosting plugin. (I don’t personally use many of Cubase’s built-in plugins because I already had lots of third-party plugins prior to moving to Cubase from SONAR, and I’ve added quite a few since then.) But in can handle most of the rest, and it’s been very stable in my experience.