ToothPaste

Nice work! Hardware password managers are great! While yours does a little more, perhaps, these might also be interesting:

Mooltipass: https://www.themooltipass.com/

OnlyKey: https://onlykey.io/

I could use this to control an android phone I have at home, which is allowed to run a banking app, and which my on-the-go phone that runs GrapheneOS cannot thanks to Google's Play Integrity™.

How do you know that shady computer won't pwn your usb device?