I think he is wise to do this while alone. Thank Heavens he has the oportunity. I agree with Cynay.
If he starts AA it will give him the freedom to go every night and maybe even 2 meetings plus coffee with other A's after. This gives them much info, and less time to think about a drink.
Guess I would see first how he intends to do it? Just my opinion, but he probably needs to do it his way.
Caring Hugs for you both.