Trying to keep data on a USB drive hidden long term is a losing game is the thing.

If you're intercepted with anything of value what you want is to rapidly destroy it.

This was the big problem I found when I was trying to figure out a secure way use Yubikeys: they're both long term unreliable, and short term impossible to wipe or destroy fast enough.

Literally a printout of 1 time passwords has better security properties in an adversarial situation.

For a storage device what you want isn't a secure store, what you want is a pin pull or switch which wipes it instantly.