I already have made them suppose they aren't registered as a breed yet ..it would be cool to do. I don't Know the the level of silkie in them because they have been back crossing and crossing for 10 years in a barn.. They look more if a feral mutt now.Maybe you can make Silkied GameFowl since they carry one copy of the Silkie feather Gene.
Your birds should be H+/h
If bred together they'll have h/h which is Silkie feathering.