Thanks for the recommendation but this won't work for my deisres. Jersey Giants lay brown eggs which will depart green to the EE egg. I want to make the birds larger and make the egg more blue. What I think I need is a very large White egg layer.
Have you considered using Buff Ameraucanas? They are supposed to be much larger than the wheatens. Also, crossing with a white layer will preserve the blue, but it might dilute it to a very pale color.