I believe in the existence of colors, but I am a skeptic about the existence of numbers. You might get away with a metaphysics in which there are no number-entities, just states of processes for counting. I'm not sure; if numbers are real, they might be properties of collections... but I'm a skeptic. [..] I'm willing to countenance a functionalist account of number "perception", but not of color perception.

OK, cool. That does indeed address the question, thank you.

When you have the time, I would be interested in your thoughts about what sort of evidence might convince you that a functionalist account of number "perception" is inadequate in the same way that (on your account) a functionalist account of color perception is.