I see. I'd say that if you now have permanent residency in the Czech Republic, you may have to dump the Virginia rego plates and get the car registered in CR, or You might get in trouble with the Boys in Blue.
As far as the rims/tyres go, I wouldn't be rolling the guards on an AMG, you can comfortably fit 22" rims on it which will clear the brakes. Try some Racing Hart, Lowenhart or Lenzo rims.