What's the state of Nostr hardware account recovery devices? 

I need to find a way to store the private key in an NFC/USB stick-like device with a self-contained biometric authentication to unlock the device and allow the person to log in with their account into another phone. 

It would work somewhat like a Cold Card but without having to memorize/store the unlock pin. Each person can then keep 3+ devices in separate trusted locations to allow them to recover their Nostr private key if they lose the phone. 

The use case is for the homeless population where memorizing passwords/words simply won't work and physical security is not good. But they do have a network of providers that can keep these keys safe for them. We just don't want to give access to the private keys to the hosts of the USB device.

Things are getting real very fast over here.