the clashing between *dark charcoal* and our (true) *black* is going to be a matter of personal preference, mostly...
i personally would be really bothered by the difference in colors, however slight.
for that, i got an mint OEM Black leather steering wheel out of a 98 Cobra (already pretty thick, thicker than the stocker) and put a black pleather steering wheel cover:
it was a way cheaper alternative to the fr500 wheel ($80 total--60 for wheel off ebay, 20 for cover), although if they made a *black* fr500 wheel, i would've jumped on it!