These are cool, and I've been using one for auth to github and a few other places for many years now.

But what if you could code a NIP-46 bunker and run them on one of these:  https://solokeys.com    They have programmable ones and are open source.  I haven't yet tried 

 Sounds awesome. Do they have usbc too? I’ll check it out. 

 I was part of their kickstarter and they sent me 4 keys:   Solo V2 USB-A,  Solo V2 USB-C,  LE Solo V2 Hacker A,  LE Solo V2 Hacker C

I guess NFC has been added to some models. 

 Looks to be sold out 

https://solokeys.com/products/solo-2a-nfc-security-key-built-with-trussed%C2%AE?variant=42482273910977