magic-wormhole ( https://github.com/warner/magic-wormhole https://github.com/warner/magic-wormhole ) is not so far from that, just add a simple GUI on top of it

magic-wormhole ( https://github.com/warner/magic-wormhole https://github.com/warner/magic-wormhole ) is not so far from that, just add a simple GUI on top of it (or just use the terminal and convince the user that a terminal does not have to be complicated), and you're good to go. I don't know how reliable it is w.r.t. connection drops though.