Well....

I was finally able to get the initial cut of supporting icc-color() in. It should support most color spaces including CMYK.

At the moment it will only be active for colors with an icc profile already set. There are some problems with the Lab and YCbCr color spaces. So far I've tested RGB, CMYK and Grayscale successfully.

To test just build the latest, have a <color-profile> in your SVG and set the color in the SVG.

So if you have a <color-profile> element with a name attribute of "cmyk", then you would just need to set

fill:#ff00ff icc-color(cmyk, 0, 0, 0, 0, 0)