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Here's what I would do and why...
I would put the EE that lays the largest egg in with your CBM flock. You can easily tell her eggs apart from the CBM eggs. When it all comes down to it, it is all about the egg. The richest olive egg that is a small/medium isn't nearly as appealing as a large, well formed, great looking egg that might be a shade lighter, this generation. From the little I have seen so far, egg size is a definite inheritable trait and no one ever says, That egg is too big. I want a hen that lays a wimpier egg please... lol.
I would not "waste" good CBM hens on an olive egger project unless they lay a disappointing color of egg. In that case, put them in with the blue Ameraucana roo too. Too bad he is not a splash, cuz then you could just cross in and out at will and always know who the "baby daddy" is. Another trait that may help you to tell heritage during the transition stage between roos is pea comb, blue gene, muffs and feather legs, but the feather legs only if your CBM roo is homozygous for feather legs. If he only carries one gene for feather legs (which you will know pretty quickly when you start hatching out his babies from the EE hen. If they are all feather legged he is likely homozygous. If you get a bit of both, he only carries one gene and you can't use that as a trait to sort out rooster fathers from your olive egger project birds. The same thing goes for the muff. Could be homozygous, or single gene in your Ameraucana roo. You will only know after some babies hatch.)
If you plan on selling pure CBM eggs I would NOT be crossing your best layers with the Ameraucana unless you were leaving yourself plenty of room to wait a month between roos to make sure your eggs are pure before you offer them for sale again after exposing them to the Ameraucana roo.