Yes, this, I think, should already be a step in such a document. Since the traditional form is a form, I would say both are ordinary forms, not extraordinary. Both are ordinary forms, which every Catholic and every priest has the right to attend. A bishop cannot forbid them. Just as a bishop cannot forbid the Novus Ordo, the same principle should apply so that a bishop cannot limit or forbid the traditional form if it is established by a pontifical document from the Pope. A bishop would no longer have the right to impose any restrictions on this form. This would be my idea, my suggestion, and it would bring true justice and peace to the Church.
Follow-up Question: What kind of ecclesiastical approach or model would that proposal fall under?
Well, no, I think it could be a so called apostolic constitution, which is a very solemn form of papal document, also juridical, more solemn than a motu proprio. An apostolic constitution. He could do it like Pius V when he promulgated the Missal after the Council of Trent. He did it in the form of an apostolic constitution. Also Paul VI, when he promulgated the new Missal in 1969, did so in the form of an apostolic constitution.