Tin foil hat approach, but I get it.

For the rest of the planet, entropy sources should be combined. e.g. Trezor seed generation mixes host provided entropy and the on device TRNG.

I don’t want to generate the randomness myself, though. I want a physical tool that doesn’t rely on a pseudorandom number generator that may or may not have a vulnerability exposed in the future.

See [here](https://protos.com/crypto-wallet-flaw-can-steal-billions-from-early-adopters-startup-claims/) for an example that illustrates my concern. It took 7 years to find the vulnerability. 

okpj

https://crypto.stackexchange.com/questions/87978/why-do-some-people-believe-that-humans-are-bad-at-generating-random-numbers-ch/87982#87982

bitcoin

Analog Entropy Solutions - Recommendations?

My recommendation is, don't. https://crypto.stackexchange.com/questions/87978/why-do-some-people-believe-that-humans-are-bad-at-generating-random-numbers-ch/87982#87982