I have thought about this before, and the best solution I could come up with is to put vents in the hood, near the rear, attaching fans to the inside of the hood, and turning them on to force hot air out of the engine compartment.
Dual fans would be even better

one on each side

But you would have to chop up your hood a little bit... but its your choice

I personally think it would look cool, but it would probably be costly. I have lots of fans, I just worry about chopping the hood up.
If you find an easy way to do this, let me know

PS, another good reason NOT to reverse the fans, is that you would be blowing HOT air on the radiator, sorta defeats the purpose