This may not be exactly what you're looking for with this thread, but Dorkings are a white egg laying breed that is cold hardy, docile and calm in temperament, and lay steadily through their lives. They don't lay the most eggs like a Leghorn might, but my Dorkings were laying almost as well at 5 years old as they did at 2 years old, and very often laid through the winter months as well. There are rose comb varieties of Dorking, but my single-combed Dorks do just fine in the winter, and I've seen minimal frostbite on even the ones with the largest combs. They're also an ancient breed that could use more dedicated breeders working with them.
Of course, they don't have the puffy cheeks of Ameraucanas or many Easter-eggers, so if that trait is a must, obviously Dorkings are not the right breed for that. But they are some of the sweetest, most gentle birds I have ever owned, and seem to check all of the other marks on your wishlist for cold-hardy white egg layers.
Anyway, that was just a thought on the subject.
Of course, they don't have the puffy cheeks of Ameraucanas or many Easter-eggers, so if that trait is a must, obviously Dorkings are not the right breed for that. But they are some of the sweetest, most gentle birds I have ever owned, and seem to check all of the other marks on your wishlist for cold-hardy white egg layers.
