I believe the other regional bars support the Bar of Montreal's position, but feel less affected by the issue. As I told you, currently an agreement in principle exists, so proceedings won't be initiated in the short term. However, if proceedings were initiated, the Barreau du Québec would be a joint applicant.
Evidence of meeting #54 for Official Languages in the 42nd Parliament, 1st session. (The original version is on Parliament’s site, as are the minutes.) The winning word was quebec.
A recording is available from Parliament.