Hi Ladies - I did say I'm working on it.  I know nothing about nothing about chicken genetics. I only know that I get a "lot" (if not all) of blue chicks that look like those in the pictures.  I still have them in a pen with some of my original, pure, French Black Copper Marans which, at this point, are their mamas, daddys, grandparents, great-grandparents, and great-great-grandparents.   I don't know if they will ever breed true but I've got nothing but time to try.
I hatch all eggs - brown or green.  Then I take all the blue birds and put them back in the pen when they are old enough to breed.  May take years to work things out but right now I'm getting the "look" I want and they lay dark olive eggs so I'm happy.