Converting color objects to greyscale inside indesign

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I am anal about this and always go through each logo and covert to CMYK from RGB or to grayscale as needed. If I was going to do it a "quick" way you could export your PDF for print, then using preflight in acrobat and convert to grayscale, save as a grayscale version. Then just merge the files so you have colour on one side and grayscale on the other.

In this line of work, anal can be a good quality to have, or it can just be a pain in the ass.

Hmmmm... that did not come out right....