"Can you edit all sorts of profiles with Kodak's plugin or only CMYK profiles? "
I have a copy of it, but I haven't used it in some time. I believe it will edit both input and output profiles, RGB and CMYK. Not as robust as Profilemaker, but not bad for $500. I'm pretty sure that DoctorPro was the ColorVision product I remembered. I don't have any experience with that, just the two others I've mentioned.