Have you thought about adding "no internet" features, like what Briar does? Would that work with Nostr protocol?
(it can connect encrypted p2p over bluetooth, local wifi or SD card... it can also create local Wifi hotspot and let other users download the app from you, which is cool and we tested it on a flight).
you can absolutely sneakernet nostr messages, though there are not yet a lot of tools for this.
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