Ok, gotcha.
Yeah, they don't hold the wheel on or together, they just hold the sprocket on.
All they are is flanged nyloc's. Nothing special about them.
If you want anodized, just pull them off and take them to an anodizing shop. They should be able to anodize them with no problem.
It should be relatively inexpensive.
As far as spikes or the likes, I've never seen anything like that,
but you could always make your own.
Buy some replacement nuts and weld some heavy stainless rod on them
or regular heavy gauge rod and have it anodized or powder coated.
Since you can't weld the nylocs without burning the nylon out of them,
I'd suggest getting some flange nuts and a lock washer.