They loook fine. The wheel nuts sit on top instead of "in" the grooves.
Reversed Disco steelies look really good on the Series trucks. They'd probably stick out pretty far on a RRC so you'd want to trim your fenders. I believe this is Ian's Rangie with reversed Disco steels in the top right:
Range Rover Classic Tire Choices
Is that ugly? I don't think so.
I'll take some pictures of the grooves + the flipped valve stems on my wheels tonight. They are currently "regular" on my Series, not reversed, because I'm trying to sell it. They look badass reversed on the old Rover, but it doesn't look very original.