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Sheesh; no excuse not to back up your BIP-39 mnemonic phrases using SLIP-39 (Shamir secret sharing):

Furthermore, you can use the same App to SLIP-39 any arbitrary 128-, 256- or 512-bit key in a way that your family can combine their data to recover.

I can't remember why I didn't pursue this, something about the hardware wallets having a way to do the Shamir upfront? In a different way than just sharing the words. Such that each person winds up with 24 words rather than a subset.

Anyway, I decided I didn't want to migrate my wallet, so I'll look into this. Arbitrary key support is also interesting. Thanks for the tip!

Yes, there are hardware wallets that support SLIP-39 natively; however, the sequence of derived wallets is different than that produced when you take the same seed and save it as a BIP-39 and derive the wallets from the BIP-39 mnemonics.

Using the app, we actually produce the SLIP-39 recovery mnemonics from the underlying BIP-39 seed, and since we can recover the underlying seed, we can regenerate the BIP-39 mnemonics, and import that into a standard hardware wallet.

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