Others have mentioned this, but I figured I’d point it out again. If you own “must have vst2 synths,” then it may be worth your time to look at Blue Cat Patchwork or Metaplugin which are VST3 hosts in themselves. I’ll use iZotope Iris 2 as an example - it’s a great little synth that is rather unique, and I’ve got some wonderful patches of custom sound design work with it. It’s out of production now. I’m using Apple Silicon in native mode (not Rosetta). Not only is Iris 2 out of production, and I can’t (won’t) load the Intel version, but it’s also an AU format.
Using Blue Cat Patchwork, I can just load the AU and go nuts:
I wouldn’t recommend this for ALL your VST2’s, but if you’re in a similar situation, this may work for you while still allowing you to use the current version of Cubase. It may at least buy you time to get work done now and give you a chance to approach a more planned decommissioning of old plug-ins.
You’ll have to rebuilt the inserts, of course, but presets and such should work fine. If this works for you, then there’s no real “sunset” to this approach. Maybe buying you some time is worth the effort.