U2F on the Arduboy?

Has anybody tried to turn the Arduboy into a U2F (Universal 2nd Factor)? A U2F device communicates using the HID, essentially mimicking a keyboard. Since the Arduboy can do that, too, it should be possible to use it as U2F. And since it has a screen one could also show the website name or other information before the user presses the button to confirm or not.

As simple search for “password” turns up a few things related to this.

Interesting idea. I just read link below and the lack of a precise RTC might be the killer.

From what I understand U2F does NOT need an RTC.

OK … then it sounds like it could be done. I assumed U2F was like 2fa and required time synchronisation.