Hmm, I wish I could help you.
I get my chicks from a small local feed store, I think they "might" do special orders, but I could be wrong, you'd have to ask them.
Those are very nice chooks, unfortunately, all my cockerels are mixed breed....
My last purebred male, was Mary, a very beautiful Welsummer, he passed in 2019 if I recall.
Do the cocks have good tempers, and could one be tamed and trained?