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Kayaken,
Marina's up here on the Great Lakes do media blast bottom paint off larger boats when it gets too thick in areas and has chipped leaving uneven surfaces. I have seen them use pecan shells and baking soda as it dissolves in the rain so no cleanup needed. I think the trick would be to find a marina that has experience and will guarantee no gel coat damage. If you find a marina with this experience, I do not believe it could be more than 400-600 dollars for a small boat as I have seen marinas up here charge $1500.00 for a 35 foot boat.

Jim G.