Default [Q] unlock pc with emulated NFC

I wanted to unlock my computer (windows) using an nfc tag, ideally the phone itself, so this is really 2 questions.

First, since android 4.4 it is possible to emule an nfc tag, but I can't find any app that does that. Can someone point me in the right direction?

Second, and more complicated, I want to unlock my computer using the nfc tag. I know the unlock part is really hard, since no program should be allowed to unlock your computer, but I just wanted an nfc reader that is recognized by windows as a keyboard. Then I scan the tag (or phone emulating a tag), which will enter the password. For those that know the yubikey device, I wanted something like that.
Is there an nfc reader that can do this?