It truly is no fun being stuck on a dive boat, in a wet wetsuit, and then “the north wind doth blow”. One solution is to scamper across the deck. Seek shelter from the wind. Strip off. Towel down. And don dry clothing.
A quicker fix is to put some form of thermal protection over your wetsuit, such a windproof walking jacket. There are two down downsides to this. The inside of the jacket will get, at best, damp. And a walking jacket can be quite a struggle to get into when you are already wearing a wet or drysut.