Dear Friends,
Axios has raised a good point in this discussion.
Of course, this is all a matter of conscience and it depends on circumstances and also, and most importantly, on one's faith.
However, the Administrator has put forward, quite correctly, that Eastern Catholics, in Catholic theology, have always been regarded as children of their Mother Orthodox Churches, to which they may return at any time, owing to their ties to them. I have attended lectures by Catholic theologians who have reiterated this.
Orthodox Churches are truly "the Body of Christ" in Catholic theology in every which way, save the dividing issue of papal jurisdiction.
This theology concerning Eastern Catholics seems also to be reflected in the attitudes of certain Orthodox jurisdictions with respect to receiving them back.
For example, in the Ukrainain Orthodox Church in Canada, the way that Ukrainian Catholics can be received into it is through Confession.
One only needs to go to Confession, ask to be received and recite the Nicene Creed without, of course, the Filioque.
Roman Catholics I have known who have entered this Church needed to go through a course of formation etc.
But it is up to one's conscience, in the final analysis, as Axios noted.
Alex