How To Fix Color Registration in Scanned Images

Hi --
I have been struggling with a problem, one that may have a relatively simple answer, but I'm just not enough of a PS wizard to come up with it.
Here's the problem. A lot of my PS work is on scanned images from newspapers. These 4-color images often have out of register colors. Here's an example:
This example is particularly bad, with all the registers out of whack (not the colors intruding in the word balloon, the skin tones not staying within the lines of the heads, etc.). I assumed I could fix problems like this pretty easily by switching the image to CMYK, and then nudging the C, M and/or Y channel contents around a little so that they'd line up properly. But I found that this seemingly obvious and simple solution didn't work at all, because as you can see in the Y channel:
it not only contains yellows, but also the yellow component of black. So if I select everything non-white in the Y channel and nudge it into place, this is what I get:
Now I have created a yellow 'shadow' of all the black portions of the drawing (especially obvious in the word balloon in this example). So I'm obviously going about this the wrong way. Can anyone help?
Thanks!

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