Apparently, Fulcrum has been been incorporating this in their wheelsets for a while. They either use 2 oversized spokes opposite the side of the rim joint, or they add extra weight on that opposite side. I have 2013 Fulcrum Racing 5's and they have 2 silver spokes straddling the valve hole, opposite the rim joint, with the rest of the spokes aero and black.
Fulcrum Dynamic Balance