As the originator of the "California front plate blues" thread, I appreciate all the discussion and also offer an option.
I drilled a couple of 1/4" holes in the plate and the "lower lip" of my '97. I folded back about 1" of the bottom of the plate and mounted it to the lip with a couple of 1/4" X 3/4" round head machine screws. I've been running with this setup for a couple weeks, including two trips to the desert in 95F+ weather and have had no overheating. You can see the car at:
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It's not a perfect solution. It doesn't look as nice as no plate, it's vulnerable to damage from bumping a curb when parking, and it's technically still illegal as the plate has been modified. Still, I think it looks better than the stock setup.