mommamia22 -It really depends on whether he is a candidate to being Mekarev and becoming a BT. If he isn’t, there’s no hope.
My non-frum relatives would never marry Goyim. Why? Because it was instilled in them that that is a point of no return. Yet many in America do? Because their parents think there isn’t anything wrong and some even glorify it -it’s Chosuv for a Jew boy to get the Shiksa!