I'd probably start with some SOP Dark Cornish. and CX broilers on the meat side.I have White leghorn and whiting true blues for the egg side. I do get a lot of eggs from the meat side now.
I don't understand your need/desire for SOP Dark Cornish unless you plan to show. The birds I got from Linda are quite large and hefty and able to breed naturally. A lot of SOP Cornish must be bred 'by hand'.
I find breeding goats artificially to be quite nuisance enough...lol But good luck at every curve!!!