By project variety do you mean the idea of Gold Laced Leghorns? If so, I don't know anyone. The only project birds I know of are the Gold Laced Orpingtons.
Your list is what I know of, too, and I'm so disappointed that there aren't any others. What I really want is a standard size fowl with regular feathering that lays lots of eggs. Polish have the top hat, Cochins have the leg feathers, and Wyandottes (the kind I'll most likely end up getting) have a rose comb but are not known for laying large amounts of eggs; I'm also not a great fan of rose combs, but I'll tolerate that for this gorgeous color.
Can anyone tell me how the Gold Laced color can be produced in a breed where it doesn't exist? What parent colors are needed?
I would love more answers!