I will weigh in here regarding the Silkied Ameraucanas. There is an extensive amount of info on this site about their history. I bought eggs and chicks and it took me a few years to establish them in my pens. I did repetitive outcrosses to standard bred, high quality black and lavender Ams (my original stock from John Blehm). That was so extensive that even when I stopped deliberately breeding for silkied, the gene still exists in some of my flock.
I sent lavender Ameraucanas to Sand Hill Preservation Center, and warned him that the silkied gene popped up from time to time. IDK if he actually had that happen, or if he was just passing along my information in his description. I know he likes that like of Lavenders and finally felt an Ameraucana was laying eggs he could call blue instead of green. Honestly, John Blehm should have the credit for those nice blue eggs. I continue to select for that, but it's easy when you start with excellent stock. I would not count on being able to recover the silkied gene from his lavender Ameraucanas.
Last summer I had 2 silkied chicks pop up in my brooders. Both perished quickly, but I have tried to put the old band back together again and have resolved to not sell Ameraucana chicks until they are a week old, so I can inspect for silkied feathers. This pen produces Sexlinked Ameraucanas in Black and Lavender, and the head spot on the lavenders is sometimes hard to see, so I like to wait until I see primary feathers I can inspect for barring. Of course, any silkied chicks will be put into brooders with more gentle chicks, like the genetic hackles, cochin bantams, etc. - and not with their fellow Ameraucanas or Ayam cemani, both of which I suspect of evil acts when I have left the room.
Someone mentioned that the reason they disappeared is because they were only kept by "fad breeders". That is just not true. I distributed literally hundreds of silkied and silkied split chicks to other breeders around the country (and I did not get rich doing this, I don't believe in extorting money for rare breeds, I'd rather see them get common). Some of them could still have them, as I have no way to follow up. Several reported problems keeping them alive and that was when I decided they were not worth my time to preserve anymore. I made sure to send some to mild climate areas, like FL and CA.
I had no problems producing lots of silkied chicks by using a silkied roo over split hens. Half the resulting chicks were silkied and the rest were splits, all good breeding material. I had trouble with the pullets and hens dying over the sometimes harsh winters here in PA. I also was not vaccinating for Marek's at the time and many of my losses were " Marek's suspicious". I hope to recover the gene this year and with vaccinated chicks, to try again. If I am outrageously successful, I might have a few chicks to share with a fellow breeder or 2, but most likely I will use the chicks to re-establish the pens I had, and put a few in the care of a friend who has "cushier" overwintering facilities than I can obtain at the working farm where my birds are housed. As I think about it, she will likely get most of the silkied pullets, and I will focus on some silkied and single barred cockerels to see if I can make silkied cuckoo Ams. I wish my energy, time and space could keep up with my fantastic mental ambitions . . .
I still would love to get involved with breeding and preserving the variety as well!
Yea, all of the leads in these threads seem to be a dead end unfortunately. 
I will definitely let you know if I ever get my hands on some! I asked to join the FB group last night but noticed there aren't any recent posts either so I figured it probably was pointless, but still worth a shot lol
Wishing you the best of luck in your search! I genuinely love silkied feathering on any breed, but I'd really love to see silkied Ameraucanas in particular make a comeback! 
