I haven’t done much work on this for a while but I ended up with a small reader that would read NFC and type it out as a USB HID.
If you have a specific requirement it is easy to modify. The password I stored as an XOR of the password and the UID so it wasn’t in plain text. But if you just want to output random plain text that can be done. I found a way to program the reader from a key so that the UID triggers a response stored in the reader, but it can be removed from the NFC chip entirely … But I haven’t programmed that yet.
Anyway, if you let me know what you want then I can make the software work. I am assuming that you can get the minor bit of electronics sorted out. (I use a trinket and a reader board).