I believe Filaret would have stepped down if they were to grant the UOCKP their own Patriarchate and not be under the EP with just a metropolitan. How is that any different the the UOC-MP with Metropalitan Volodymyr answering to Kyrill and Kyrill the head of the UOC-MP and the UOC-MP just a part of the Russian Orthodox church, not its own independent Patriachate?
Met. Volodymyr is canonical, and the UOCKP (minus the P I should suppose) under the Phanar would not be.
The Phanar can't grant the UOCKP, so-called, autocephaly. It did that in Poland in the '20's, and the Patriarchate of Moscow is in far better shape now to prevent such interference (as it was in the '50's, when Poland received its canonical autocephaly).
When Met. Volodymyr reposes, the offer should be made to receive the UOCKP so called without Patriarch
Filaret, with full autonomy if not autocephaly. If Patriarch
Filaret dies first, Met. Volodymyr and his Holy Synod should be made autonomous immediately, with full power to receive the UOCKP so called.
In either case, Ukraine should end up autocephalous, and elevated to a Patriarchate.