Would you make this a requirement for union with Eastern Orthodoxy?
In my mind unmarried clergy is a discipline and this is what the Catholic Church teaches. Therefore, I don’t think married clergy would be an issue. But, I am not sure how that would work because Traditional Catholic teaching says true unity happens in the Catholic Church and therefore all must become Catholic. It’s not about picking and choosing what is ok in each other’s denominations.
My earlier post is asking for support that the Catholic Church teaches that unmarried clergy is doctrine because I don’t think there is any such support.