His attitude toward AA dovetails with his attitude about alcohol: He doesn't need it because he doesn't have a problem. He finds excuses not to go just like every addict finds excuses to use.
If he had actually gone and listened, the premise is that you rely on a "higher power" however the individual interprets that. There are no homilies or sermons. The twelve steps are about being accountable for one's self and one's actions.
As far as Antibuse, how long will someone (you, in this case) baby-sit the patient and make sure it's consumed? For that matter, what if he he simply turns to cannibis as a coping tool, and his life devolves from that?