I'm actually thinking of a different tactic entirely.
I just finished brushing up on the character race, the Aventi, in Stormwrack, and the differences between what that says and what M says about the background look promising.
He's a mechanics player more than anything else. I'm going to try and make him into a story player.
Our game is on hiatus for a few months, due to time conflicts on the weekends, but I'm not going to let that time go to waste. I'm going to write this character an engaging back story, one that reconciles the fact that his peopl are all devout followers of Aventurness, the sea god, and are predominantly Lawful, with his character who is Neutral Good and follows Taiia.
I'm going to send it to him in pieces, as I get it written, and get his feedback. I want to draw him into the story.
Then, when I next DM, his character will receive a call for help, not from the land based church of Taiia, but from her home village under the sea. The Aventi, it seems, have no problems with either men or women advancing.
Since we're running something that's loosely based in an historical Earth, and his character comes from the Canary Island region off the coast of Africa, I looked up the local religious history. That region, off the coast of Morocco, used to be heavily influenced by the Berbers, as far as religion and culture go. (The Canary Islands have a sparse population, and no separate cultural identity that I've been able to dig up.) This Berber influence would explain the "Men rule/advance, women stay home and serve" attitude that the player has said his character left to escape. It ties in nicely.
Oh, and the Berbers' religion had Jewish, Greek, Roman and Egyptian influences. Easy to choose the monotheistic version, for her homeland.
By the book, M's character will be a very poor fit in either culture, being a religious apostate among Aventi and a cultural apostate among the Berbers. Which sounds like a very fertile ground for story.
When our last campaign ended, M was so committed tot he story of his character that he wanted story points resolved, to the point that I ran the "Date with an Angel" scene that I wrote about here. (It might be in Story Hour). He couldn't let it go.
By working in the same type of emotional commitment to the story, we might make a Role Player out of him yet.