Is the main an in-mast furling main? If so, you may need to replace the spar or modify it. Replacing it would reduce weight aloft, since you won't have the furling gear in the mast anymore.
It is, alas. And by replacing the spar you do mean the whole mast needs to be remade, with spreaders, etc?
Is there somewhere I can check the cost (and once I am at it, for a proper rotating mast cost?)