Okay...then if the West believes it is "through the Son" then maybe they should SAY the creed that way. Unity achieved at the expense of the truth, is not true Unity at all. The "Council" of Florence was an example of just that.
And I might add that the Patriarches of Rome until around 100 years before the Schism agreed that the filioque was wrong as well. Look on the doors of St. Peters. The truth is there for the entire world to see, placed there by Gregory The Great.
What you are saying means, simply put, that the Latin Church has to die in order to come into union with the Orthodox Church. In other words, there can be no unity.
I doubt Christ is impressed with us for being so unforgiving and intolerant of each other.
Here is a real simple solution: the Latin rite maintains its form of the creed, because that is the way Latins see it. The Eastern rites maintain their form of the creed, because that is the way that Easterners see it, and when the two halves are in ecumenical services, they use the Apostle's Creed, which is older than both and all agree to it.
And the rule that attempts to geographically limit rites to certain areas can be abolished. Americans, for example, can choose Greek or Russian or Old Latin or Novus Ordo or Maronite Rites, etc. All of them are different in their liturgies and emphases, yet all are affiliated with each other in two great wings of the One True Church.
This does not have to be a source of perpetual division, unless we choose to make it so. And when we do so, we are choosing confections of our own made centuries after the fact as an excuse to not admit to the Lord's Table (and tolerate the differences of) people whom God Jesus prayed would remain united in His Gospels.
There is no virtue in seeking out ways to remain divided, when it is possible to see clear to ways that could leave us together.