I want to connect my new 2003 hunter 44ds to shore power in Australia and was wondering is there any way of adjusting the isolation transformers to do this?
You do know they also drive on the wrong side of the road down there...

...But to be more serious. A few years ago I bought a UK greda spin dryer.
It runs on 240 volts and has the strange to us plug. I found on line a source for a 110 volt to 240 volt converter. It's a little hefty white metal box. It came with all the proper fittings so has to be able to handle many different set ups. Say even Euro 240v down to US 120v. It was a while ago so I do not remember exactly which one. You may find a converter that you can hard wire into your boat but the size needed maybe some what cost restrictive.
What ever the case here are some links, which will hopefully aid you in your quest.
http://www.charlesindustries.com/main/ma_adapters.html
http://www.nauticexpo.com/cat/water-electricity/boat-converters-voltage-regulators-IB-992.html
BTW.......I believe It maybe cheaper and simpler in the long run to just leave the USA electrical as is and just run new 240 volt Euro wiring thru out the boat adding the Euro style electrical outlets next to the standard US GFI outlets. But leave the US and Euro trash separate.

You will have to buy new shore power cords of course and install a second set of electrical service connections on the boat next to the existing. You will need to also install a second service breaker panel for your Euro trash outlets....Be very safe and make sure you follow all safety codes plus mark all the wiring so any idiot can see whats what! ....Check your battery charger it may have a 240 volt Euro option already. Check as well the size of your 12 volt to 120 volt inverter, You can set it up so that it feeds your ships standard breaker panel there by handling your USA GFI standard outlets. For safety on the American side of things I would do a shore-power to inverter selector switch. For all your other appliances such as Microwave,a/c units,water-heater a smaller converter may suffice for each appliance. Just pay attention to our 60hz.... Verses there 50hz...Difference..... Make sure the converter can make up for this difference as well as the right sign-wave frequencies.
If I was in the same situation I believe this would be the route I would take. This way I would have all the bases covered were ever I cruised .
Good Luck!