Hello Reuben, I am sure you have already heard of this organisation but just in case you haven’t, Homeshare Australia.
It is based on an international model of brokering a relationship between a home owner and a homesharer, they assist to create a mutually beneficial relationship and are available during the time of people sharing a home if there are any issues that need a third party to resolve.
It has great success and is a really great model to create very affordable housing solutions for people and it can be a program that can create affordable housing faster than building it.
I have worked on a project with a community organisation in Geelong to also create house designs that make it easier for people to live together, ie. two kitchens, two lounge rooms, two living rooms.