Maybe a #meshtastic / nostr:npub17tyke9lkgxd98ruyeul6wt3pj3s9uxzgp9hxu5tsenjmweue6sqq4y3mgl plug-in that encode and transmit signed transactions / XPUB as : 

https://i.stack.imgur.com/5HsXJ.png

Or auto-broadcast on Internet connected clients/nodes/wallets.

nostr:npub1tv8gmfhalwnxxquxjzeh6gtdsdz6vg7vx0s3rt7s7uuw6aujh32qn77wn2