Real Wire Wheel lug nut question ?

I would strongly urge you not to grind on lugnuts. One, you could heat them up too much and weaken them, And two, it would be very difficult to shape them. I would suggest you call the company that makes the rims and see what they suggest. Have you tried looking at security lugs? They may be a pain, but they come in all sorts of small sizes. I would hedge my bets on the rim manufacturer.