complex 25th word on your standard seed does a damn good job. I’ve seen people post their seed phrases online as a challenge but because their 25th word was too complex for a brute force crack nobody ever got the money. Another option is single vendor, single seed multisig wallet created by using the same seed/HW but different 25th words on each key you add to the multisig setup using your HW
Discussion
That’s a good option. Like it.
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
Neat ideas folks.