Phil N loaned me his aluminum hex nuts when I put my car through rego. The way my spinners stuck out it would have never got through.
I machined up an aluminum socket for the nuts. The socket is machined so it drives the flats on the nuts rather than the corners and doesn't leave any marks on the wheel nuts even though they are aluminum too. I reckon the nuts are hard anodized hence the greenish/grey color.
The socket has a 4' bar that runs through it and you can stand on the end of it to tighten and loosen them. Sometimes need someone in the car with their foot on the brake to stop the wheel rotating.
On the spinners I use a lead mallet and it doesn't seem to leave any marks on the forged aluminum spinners. The mallet face deforms quite a bit on each hit so it's taking the brunt of the damage.
Cheers