Grayscale to Sep on K Plate Only?

Doing some CMYK School Booster Cards 4/1, and there are a couple
Adverts that are required to be grayscale (Restaurant Logos) on the front.
(the CMYK Side)

I've tried a bunch of thing to get the grayscale logos to Sep out on the K Plate
only, so the pressman doesn't have to build the black on these logos.

I tried to put the logos into a separate file and make them a monotone
C0, M0, Y0, K100. But then pulling them back into the CMYK job on
a layer they revert to being seped to all plates again....

Any suggestions?

--
Ric Seyler
Seyler Design & Printing

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