I would suggest that you keep your nose out of it. It is not your business or battle to fight.
Don't focus on what your fantasies are, focus on today, he is still drinking, until he stops and really embraces a strong recovery program nothing has changed. Marrying a known A is a step that I would not encourage anyone to take.
Have you read Codependent No More? The stickeys at the top of the forum and cynical one's blogs? If not, I would suggest that you do all three.
Work on you, get healthy.