A simple curses GUI for switch-lan-play. Written for GNU/Linux but should also work on Windows (I haven't tested it so don't take my word for it)
Place your lan-play client, lan-play-curses.py and servers.json in the same directory (or edit the path yourself) and launch the script. Run it as root/admin
$ sudo python3 lan-play-curses.py
In servers.json, the name and pmtu fields are optional. Set a pmtu of 500 to play Animal Crossing. Add/remove servers to your liking by following the template.