The Federal Department of Foreign Affairs provides information about the administrative tasks you have to face when returning to Switzerland.
Finally ch.ch is a service of the Swiss Confederation, cantons and communes and covers most likely every administrative topic relevant for people returning to Switzerland.
Get an overview of what to take into account of with regard to health insurance when returning to Switzerland with this article from the Swiss Revue, September 2015.
CSA Oceania, the council of the Swiss abroad delegates for the Oceania region have a website! Created in October 2016 to improve information exchange and be present as delegates online.