In some very old literature, I have read about "Brilliant Green" and "Malachite Green" giving some red sensitization. I doubt it's what you are after tough. Brilliant Green is cheap, though, and I have a bit coming in to try out. It's used in Russia like Mercurochrome as an antiseptic. You can get it through eBay.
I have just tried using chlorophyll but with no effect at all. When do you add the chlorophyll and how much? Maybe I did not do it right.
I've also tried erythrosine for green but added just before coating which did not do much of anything. Next time I will try during precipitation like PE says to do.