I had something typed out to reply the other day and the SKY FELL.... the website was down for a bit so it didn't submit.
My experience with copper on pullets..... limited LOL. The roos I had from Pinkchick put copper on my pullets. I was so excited to breed those pullets back to their sire and they both died before I could do that.

I tried to use a roo with some copper on his breast, didn't work. I tried him with some reg BC pullets and it didn't work with them either.
So I have those pullets in my pen now. I had them with my Blue copper cockerel and the chicks didn't have the color I expected. I talked with Vicki and she suggested I swap cockerels and use the Black Copper Roo to set the Copper in the pullets. I have JUST started to hatch from that pen and eggs are sparse but I like these chicks better.
I meant to add that adding copper to blues is harder than black..... per Vicki and I agree. I find far fewer blues with copper than blacks.
You should just plan on testing and see what you get. Document what you get in chicks. It just takes SO LONG to see what you end up with.