Do you believe that Vatican II is heretical? There is surely a large subset of R&R that don't think it is... just ambiguous, misleading, wordy, etc.
If you don't think Vatican II is actual heresy - then maybe your OP has some traction...
But,
If you do believe it is heretical (actually heretical like THIS), then simply by accepting it (even with ZERO practical implementation/change) the Eastern Catholics would have wedded themselves to heresy.
"He who does not call others back from error when he can, demonstrates that he himself is in error. "
It’s very difficult for Latin Catholics to understand this, and it has been repeated here many times though ignored:
The manner of receiving Faith in the East is through Liturgical prayer. Lex orandi, lex credendi est. Vatican 2 has not been received by the Church because of this ancient rule of Faith.
If the East had “received” Vatican 2, it would be universal. The Catholics of the Eastern rite do not pray religious liberty into their creeds any more than they pray the Filioque in their creeds. They look at Vatican 2 exactly in the same way as they look at the Filioque. “Has it been received by the Church?” “Is the universal Church praying that doctrine?”
This is the hidden jewel of the crisis that most Latins have not yet discovered because it takes years to learn the East through it’s Liturgies and prayer life, which is it’s catechetical life.