I’m having a little trouble locating the links, but there are complete Amiibo bin dumps floating around on the internet. I’m not sure how difficult it will be to take those files and emulate the NFC chip. There’s an android application which can write them to actual NFC “ntag215” cards, which may be of some interest in terms of seeing how it’s done: https://github.com/HiddenRamblings/TagMo
Here is a “v4” dump - not sure how up to date this is: https://drive.google.com/file/d/1-TWgQAH6v7R-odL5A0Rxu6wI_dWpkNMr/view