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
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