there might be a problem with installing a second lower hook. if the lower hook is not removable, it will wear a hole in the sail. if it is removable, it won't be there when you need to reef the sail.

as far as the bolt rope blowing out of the luff track, you might consider having a metal slug attached to the sail at the head. if a slug can get pulled out of the track, you propably don't want to be anywhere near the water.