Don't worry!
AFAIK the Rolex metal composition isn't white because of plating it with rhodium, but because of the mixture of metals in the alloy.
Rolex sports models are hard to get at a discount. I don't know how this is with an Airking. I would prefer to buy one second hand, which is probably waaaay cheaper...
Paying over 10.000 Dutch Guilders (yeah, I know, we have been fooled into the Euro) for a steel watch with a gold bezel? Not something I would easily do.
At that price, I would want a precious metal watch.