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In regards to "stealth" upper grill blocks, I've used one similar to the one on the "Maverick" commodore that you posted earlier, but using black plastic.
Mine wasn't on a commodore, it was on my cordia, but by being directly behind the grill, it became almost invisible to casual inspection.
As I understand it, even though it may create a blind cavity on the front of the car, once that cavity is full, air flows around it like it's not there. The trick is to totally seal that cavity so it stays full.
On my cordia, I removed the grill and taped the plastic in place. When refitted, the edges of the plastic were trapped against the bodywork as extra insurance if the tape didn't hold.
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