I can definitely see potential in the color correction idea, but usually that involves keying ona fairly narrow range of color so I don't know how it would hold up under a wide variety of lighting conditions - although it's not like you're scattering money in every scene unless it's a very very bad heist movie XD

I have a colorist friend that does a lot of mega-budget projects so I'll drop him a line and ask...although I suspect his answer will be 'anything's possible if you're willing to write a large enough check.'