How about instead of a tablet device a literal metal tablet with the QR code engraved in front (and 12 words on the back with a covering).
That way it's guaranteed to be 100% offline.
The mobile app is probably good enough for a spending wallet for now... but I'm sure in 10 years things will change a lot. Wearable tech, VR/AR will progress. There will be something better and more intuitive.
nostr:npub166lfd9f8hhpt225gpcx4zuf4uw8pl50t8y9dg2449gt3v50kedpqpe5utk have got the metal engraving part covered.
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