You write the note on your desktop and scan a QR code with its contents. The mobile app signs and publishes it directly to a list of relays it has internally.

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So, we are back to a list of relays? :)

Nice catch, yes, that came to my mind too. But writing to is much simpler than reading from -- still this app could allow you to pick the relays to publish each note to in case it's a contextual thing.

Actually it makes more sense for the target relays to be exported inside the QR code too from the desktop app.