As that particular formulation, "To Jesus, through Mary", derives specifically from St. Louis de Montfort, a very popular and highly regarded Western, post-schism saint, it seems highly unlikely that it would be, as you say, "Orthodox"
Yes, it has become evident from this thread that this particular Roman Catholic formulation "to Jesus, through Mary" is not Orthodox. That is a big relief for me, since I don't see it in Scripture, in the Fathers, in our liturgies or in our icons.
As I have related, I have more at stake than most Orthodox in seeking union with Rome. Yet I don't want union through simply absorbing Roman Catholic theology and praxis, including Marian hypertrophy. I spend a lot of time with Roman Catholics and I think many of them have absolutely no limits in their Marian devotion. My sister-in-law told me frankly that she has no relationship with Jesus but she does with the Virgin. I nearly started to cry. I know that is not authentic Roman Catholicism and that even the Bishop of Rome would reject that. But unfortunately, a lot of RC laity have some sloppy ideas regarding the Theotokos, that we Orthodox need to reject for the sake of union. As Metr. Jonah said to the ACNA:
"We share the hope of full ecumenical relationship and reconciliation with the Roman Catholic Church. However, I believe that we are of one mind, the Anglicans and the Orthodox, in that we reject the papal ecclesiology and the theological distortions of papal infallibility, and some of the hypertrophy regarding Our Most Holy Lady Theotokos, the Ever-Virgin Mary. We love the Most Pure Mother of God, but I think we have to remember what is right and decent and in order. And it’s only by, only by the repeal of such doctrines that there is going to be any possibility of reconciliation of the Roman Church with the Orthodox Church… some don’t like that."
And so I would just pray this: Holy Theotokos, Wherefore thou art blessed by all generations, the Favourite of God, more radiant than the Cherubim, and more honourable than the Seraphim. Thy prayers preserve us unto the end uncondemned; for saved by thy help and protection, we send up glory, praise, thanksgiving and worship for all, to the One God in Trinity and Creator of all, now and ever, and unto the ages of ages. Amen.