I'm very glad that I was able to confirm that plush's existence for you! I sincerely hope you find a reasonable price for her, the aftermarket can be a bitch sometimes.>>7676536
As for your request, I did some searching around and see your exact problem with variety. I actually have the Harry Potter plush for Fawkes (the phoenix), and it's soft, but not the softest it could be. It does has wire in the legs and neck that allow for limited posing if that interests you. Fortunately, I was able to find several phoenix plush that aren't affiliated with a franchise. This was fun to look into because I love mythology, and phoenixes happen to be among my favorite creatures.>Hansa phoenix plush
There seem to be two versions made by the same company. This is the largest and nicest of the batch that I saw while researching. Unfortunately, the few listings I could find are obscenely priced.>Folkmanis Puppet>Keel Toys Animotsu Plush>Squishable Phoenix
There are also plenty of one of a kind, self-made plush by various artists, but I assume you're looking for plush made by a company.