Sorry for the delay, my internet was down for about four days.
Actually something obvious dawned on me shortly after posting. I had forgotten about Set Channels, which gave me exactly the effect I was looking for when I told it to set my blue channel to green. I guess I was over thinking things; I’m too used to doing slight color tweaks with levels, curves and a touch of Hue/Sat.
Sounds like a helpful program though! Likely would be helpful in other situations. I’m currently using CS3 but am probably going to upgrade to CS4 one of these days.
And thank you for your help! Hopefully next time my internet won’t go out on me shortly after I ask a question so that I can be more prompt.