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If you go back to the original object(s), you may:
0) Copy everything, and hide the original or save it in some other way;
½) If needed, select everything and in the Transparency palette/panel reduce the Opacity so that 1 gives the right shades of grey;
1) Select everything and (depending on version) Filter>Effect>Colors>Convert to grayscale.
More professional? Maybe more cheating.
I don't have that greyscale conversion filter. Where can I get it?
It's in Edit > Edit colors
You can also create a color group of greyscale swatches and then use Edit > Edit colors > Recolor art.
Thank you for the correct reference, Monika.
dg, I apologize for misremembering. Once it was under Filter, then I believed it was under Effects.