Concrete -
I had the same idea because I have the "center caps", but I didn't execute it because I was worried about wobble and them unscrewing themselves. If you could find reverse screws and nuts, and kept track of the placement, you could install them so that they are always being tightened when the tires roll in the forward direction.
I'm also a big believer in extra washers to "spread the load",
.
CarloSW2