It seems like the lady going for the reversal of the annulment is likely going to hurt herself more than him. I can't imagine U.S. will recognize her as a valid wife if he had a valid annulment at the time of the marriage to the current wife. So the outcome will be that his ex will be unable to get married in PI since she is in a valid marriage according to PI law, while Alvin continues on as normal. Or if he really wants it to be over he just needs to fly over there meet with the judge (pay more than his ex did) and have it decided in his favor.