There is usually a color/greyscale setting within the Properties of the actual printer you are using. Set it there for your new publisher set, but greyscale is greyscale - you'll get the same results as if you changed the drawing's settings. A light blue, when changed to greyscale looks bad, that's just a fact.
The next best way to handle colors AFAIK is by adjusting the drawings settings themselves. It's ugly but you could duplicate the whole layout and select all the drawings at once and change the drawing's setting to use Greyscale colors instead of Defined by Penset. But I'm sure you'll find you'll get the same result as the former method.
Greyscale is greyscale.
Cheers,
Link.