I LIKE the Kedge Anchor solution that was recommended earlier. A Kedge anchor is NOT A MOORING. It is a large (storm) Anchor..like a Danforth..or maybe a CQR placed out away from the boat to Windward..in the correct position..to be determined... by the conditions. Trial and Error. . It is an Anchor ...so you are not bound by any stinkin Mooring regulations.
The kedge will have Chain AND Nylon from the anchor up to the boat. Just like an anchor. Simple. DON'T YOU JUST HATE SIMPLE....??
NB
BTW: If you put a granite/cement "SINKER" out there...you GOT a Mooring