An Office of National Security: Making it happen

Prior to the election, Labor promised two innovations in national security.

First, a Department of Homeland Security and Second a new position of National Security Advisor. 

The Homeland Security agency concept has been shelved, subject to a review, and its confirmed that the National Security Advisor isn’t a Ministerial position.

Assuming the National Security Advisor promise is still on the table, what might one look like?