You sure? Checked google and I have my doubts. I'd actually plump for r32 Skyline and Peugeot 206 spinning (two car's you'll certainly find in Europe and at the Nurbergring).
The cavalier, as you said, is rare out side of america. The cobalt is more likely to make it to foreign shores than the cavalier, partly because we used to have the opel/vauxhall cavalier (a GM product BTW ) and partly because (as it seems) all cavaliers are ten-a-penny cars in their respective markets. The cobalt is more premium so would be more attention grabbing than the cavalier.
In any case I hope your right as it would certainly be a sight in Europe