NA meeting and buy the Big Book, and the 12 Step Book, and maybe a book of Inspirational Quotes
, and send them to him. It would be a nice "Care Package" and maybe after he reads the material , he might have a change of heart.
In the interim, you could read them yourself, so that you know what the program is about, and you can help to keep him accountable, in NA english. There's another thing that might help. Him getting to talk to an Addictions Therapist.