You should be able to run the regular site behind a public facing server like Apache, with the runserver_socketio part just serving websockets on a separate port. As described in the question you linked to, you'll need to work out if it's possible to proxy websockets through your web server if that's a requirement for you, but as also mentioned the gevent server used by runserver_socketio is more than capable.

When running separate instances like this, the "out of band" functions won't work, as they depend on shared state:

django_socketio.broadcast(message)
django_socketio.broadcast_channel(message, channel)
django_socketio.send(session_id, message)

You'll also need to add the SOCKETIO_PORT to the regular Django project's settings so that it knows which port to use.