Sorry, the whole idea of moving abroad was to self-fund a retirement. Probably the same objective as you? Some of us unlucky not to have worked for the state sponsored and protected domestic and international airline.
Clean up on Medicare? I paid $1000 AUD per month ( small family ) on top of company health insurance abroad. I did use Australian medical services, however, I paid for them. Returning home I now have private health insurance.
As an expat, many pay tax on what locals do not. Including their family home, more CGT, flat tax rate on earning inside Australia etc. That all said, putting number on it, I think one year abroad as a Captain was worth three to three and half years work as a domestic CAPT back home in Australia. So I'm a self-funded retiree now after a pretty grim 2001.