Great thoughts in this thread.
I think a lot of the fear of Al-Anon is the fear of the unknown, and the assumption that it exists for tearing down the alcoholic or preaching divorce or breakup. Of course, some Al-Anon groups do degenerate into that, just as some AA groups degenerate into places where "recovery" consists of listening to drunkalogs and "wisdom" like "just don't drink" (duh, if alcoholics could "just not drink" why would they need AA?).
It isn't your job to help him decide who his sponsor should be, or to convince him of the helpfulness of Al-Anon. Your job is to recover, yourself, in the best possible way that you can. I wouldn't allow his opinion, his sponsor's opinion, or his group's opinion of Al-Anon to dictate anything you do for your own well-being--you are the only one who can make that determination.