All that and keychain sized! LOL! That's a tall order. Besides the Gerber Carnivore, there's also the Gerber Recon. Has white LED and red, blue, and green filters. Runs off 1xAA, which you could charge with a solar charger. Water resistant. No UV, though. Cheaper than the Carnivore. Definitely not bright, but I'm assuming that you don't necessarily want bright when you're tracking something at night.

You could add UV capability by getting something like an Inova X1 or X5. The X1 is also a 1xAA light.