Respectfully and in my opinion, it's not your thing to worry about. It's his recovery or not, and it sounds like he'll do what he wants anyway. I'd suggest you take care of yourself, and try not to worry about that grown-a$$ man's decisions. His inventory, his life, his decisions.
Having said all of that, my wife's treatment center considers it a bad idea and it's on a list of things to avoid that she's been given (and right now she fears relapse so much she follows the list like Mormons follow The Book of Morman). I'd add that I'm certain I'd spin up into a gigantic conniption fit if I ever saw her drinking "non-alcoholic" beer or wine. It would set off every f-ing controlling thing about me, as well as push all my fear buttons, and the outcome would probably be pretty ugly.
Easier said than done for me.
Take care,
Cyranoak