Yes, the Extract Channel plug in can give you several channel options. For this I assume you would want CMYK, which this plug in does use. I hope you have it, it is in effects->color->extract channel. It may be part of one of the effect packs, explaining why I didn't find it in the plug in index. Add: Ah, the Ed Harvey Effect Pack for 3.5 has it.
Of course, you would need to copy the original image into the proper number of layers and then run the effect on each layer. It takes a minute or so for four color layers.