Whilst the options are clear, what possibilities exist in Australia? Most of the suppliers of components are here in the UK, getting anything large and light weight to Australia is going to be expensive.
I'm surprised that electrolytic corrosion is a problem in a country that is mostly dry and I understand, doesn't salt the roads in winter. Sacraficial annodes only work when there is an electrolyte present, usually salt water on a boat. I suppose living near the sea is the cause of the salty moisture. Especially in Melbourne.