Although I believe that there needs to be a review by a cryptographic
engineering expert (ideally Pieter Wuille, who may have to hold his nose to
give it a pragmatic review) and I believe such a review will likely some
suggest some improvements, I do think something in this area should be done.

For instance with the offline tool #LetheKit
https://github.com/BlockchainCommons/bc-lethe-kit, you could go to your
vault, input your BIP39 from an offline titanium key or SLIP39 Shamir
shards, and then derive a child key in BIP39 form that can be delivered via
QR from the air-gapped LetheKit to another device you take away.

— Christopher Allen