Avoid recreation of external address in ports.conf

This might be something simple, but is there a way to avoid Virtualmin adding the external ip and port in ports.conf when a new virtual server is created and Apache is restarted?

I’m running Apache on localhost:80 for use with Varnish on the external port 80, but each time a new virtual server is created the external address is re-added to ports.conf.

Hacky solutions welcome! Thanks for any insight,