How do I add a secondary web interface listener?

I want to add a secondary web interface listener, i.e., something outside of port 8000. The ultimate goal is to then add SSL to this secondary listener and update various internal documentation to point to this new port (after I have SSL running on it). I don't want to immediately add SSL to the existing port (8000). Anyway, everything I've found seems to talk about adding a listener for the purpose of pumping data into Splunk, which isn't what I want. I want the *web interface* on a secondary TCP port.