To be sure if they are Communists or not, the Vatican must be in total control of their ordinations. We can not let some just slip through the cracks. As to your answer can't they be a Nationalist church like the English, in a word, NO.. not if they are going to claim to be Catholics in communion with the Pope.
Here you bring up the age old argument. "Only the Vatican". We will never agree on that premise! Someday the entire Christian Church will unite, IMHO!