Can Orthodox Church members be extraordinary ministers in the Roman Catholic rite?

It is known that members of the Eastern Orthodox Church who are not formally joined to the Roman Catholic Church can receive Holy Communion and some other mysteries (such as Confession) without any obstacles. Can the same members of the Orthodox Church who consciously receive Holy Communion and do confession in the Roman Catholic Church but are not formally joined to the Catholic Church take part in extraordinary ministry? If not, which Canons restrict them from doing so, and why?