I hope you end up adding lots and lots of plushies to the list. Something like this would be so useful!
It's awful to try and gather information by just typing names of companies that I'm pretty sure made MLP plushes at some point, trying to pick through the things that come up on Google image search and trying to link them back to who made them, finding some I like and then finding out they aren't sold in my country...it's all very confusing, and a tool like yours would be immensely helpful.