@TheTropix It's so funny -- but today -- an online chicken buddy of mine sent me a couple photos of two Lemon Cuckoo Niederrheiners and thought they were beautiful! She thought they were Cuckoo Marans and I had to explain to her that they are Nieds! It takes a while getting a rare breed noticed by the general public who only know Rhode Islands, Barred Rocks, or Leghorns as chicken breeds! It takes about 5 years of consistent poultry shows and a group of breeders to establish a Standard of Perfection for a new or rare breed of chicken before the APA will even consider listing a new breed as a bonafide APA American breed of chicken so it doesn't happen overnight. It took the Dominique breeders a couple decades just to save the Doms from extinction back in the 1970's.
I'm a senior and live in a zone allowing only 5 hens/no roos so breeding projects are out of my scope but I keep in touch with a couple rare Breda breeders who are facing your dilemma to get diversified genes into their Breda. Breda are like Nieds -- not accepted into the APA yet. It takes years so don't get discouraged. I mean, I had an online buddy that thought the Lemon Cuckoo Nieds are gorgeous! Add meat quality and decent egg production to the attributes and you'll eventually have a winner!
Many chicken breeders will pick one breed to concentrate genetics improvement to the exclusion of other breeds. I have a KS breeder who specializes in creating their own exclusive varieties of chickens like a Blue Laced Gold Brahma, or Blue/Black/Splash Breda, or White Peacocks, or rare Yamato Gunkei -- not poultry on the popular list and very rare -- but that was their particular passion to concentrate efforts on because they happened to love the breeds. I've known a lot of breeders that gave up on the Breda years ago because it was such a rare unknown breed but a whole new group of Breda enthusiasts has sprung up to take up the breeding project after realizing the potential of the breed -- they are very decent egg layers and a rare unusual looking chicken with no comb, a triangle tassle on top of their head, cavernous V nostrils, and long feathered legs/toes, and have a docile non-combative temperament. New breeders loved these attributes and thought them worthy enough to pick up the breeding projects. The Breda have been in the USA a little over a decade but chickeneers are just beginning to recognize the Breda name of a bird that's been around yet not on the APA list yet. This may be true of the Nieds also -- takes a while to get the word out and to find other Nied enthusiasts. You wouldn't believe how many online researches I did or how many people I PM'd on BYC to find ONE Breda owner or people who used to raise Breda but no longer did for their own various reasons but they were still very helpful to give me more info about Breda qualities and quirks -- it's all going to depend on how much you wish to pursue the Nied project and meet with other Nied breeders in person -- that's the best way in the long run -- but it takes time!