Nice tool. Another poor (paranoid) man solution is 1/ to rely on Tor to expose your local SSH server through NAT/firewalls, 2/ to use ephemeral classic SSH key

Nice tool. Another poor (paranoid) man solution is 1/ to rely on Tor to expose your local SSH server through NAT/firewalls, 2/ to use ephemeral classic SSH keys to allow the guest to login on the host 3/ to share the session with screen -x. Much more secure IMHO, but probably slower and also a bit more complex to setup as the host and the guest must have Tor installed.