I think that the Catechism wisely prefaces that with “In the Latin tradition”. If the Magisterium wanted to shut every door at this, they would not refer to a local belief.
Of course, Aquinas also taught the dual procession in the eternal realm.
The basis upon which this is to be resolved is to stop short of proclaiming the dual procession as dogma and rather recognize it as a Latin tradition, backtracking a bit from the Florence, which does nothing but harm to the East-West relations at this point anyway.
The dual procession, like Palamism, is something that is useful and each side should attempt to convince the other in its universal and dogmatic character; but it cannot be the basis of reunification. This discussion should follow reunification, all the more so that these ideas were introduced in a non-ecumenical fashion.