Is there a VST-3 plug-in for Komplete Kontrol?
Not currently, but they just announced the next update to Maschine would include a VST3 version, so I would assume the KK is not far behind as they usually release updates for both around the same time!
@ChrisB1969 There's an update for KK planned in summer but can't promise it's VST3 related. Will most likely be silicon compatibility first.