similar idea but instead of passphrases, using BIP85 child seeds to construct a multisig wallet using a single hardware device

zero transaction history at the master seed and child seed levels (suggests zero usage for anyone who might discover)

optional passphrase on "child seed 2" to add more "what you know" in recreating the wallet descriptor (think 3rd xpub)

backup requirements are 12/24 words, index of child seeds (out of 10,000) and optional passphrase, if used

note: not a recommendation, more of a thought exercise to poke holes