If we accept your position the the Greek church, and not Rome, should be the final authority on issues. You willing to concede that?
No I am not willing to concede it.
The Churches at Rome, Alexandria, and Antioch were all originally ethnically and linguistically Greek as far as I am aware. They just eventually shifted over to their native tongues, so they do not have as clearly unified a 2000-year linguistic tradition. That’s why I concentrated on the Greeks.
All the ancient Churches agree on the ever-virginity of Mary, and it was held by a number of Reformers as well, as others have shown here. Fr. Hunwicke just made the case that there is no ground for opposing it in the Church of England either:
http://liturgicalnotes.blogspot.com/2016/09/the-tome-of-s-leo.html