No the German Westfalia camper was never sold in Australia.
However the Australian 'Sopru' conversion was approved by Volkswagen Australia as a 'factory' conversion, and sold new through VW dealerships. Eric Sopru's company originally started in Adelaide and began converting VWs in the late '60s, using brand-new Kombis from the Melbourne factory. They nomally converted the Type 23 Kombi (window van with seats), not the basic panel van or the Microbus. Sopru later set up another workshop in Melbourne. In 1972 Sopru was bought by LNC Industries, who also owned VW Australia, and they opened a new headquarters in Beaconsfield Rd Silverwater. Sopru campers had normal Australian new car warranties supplied by LNC Industries. Sopru parts were listed in the VW spare parts catalogues with VW 'CMP' part numbers.
For a few years the ACT-based Dormobile campers were also sanctioned by LNC Industries as a 'factory' camper conversion. Dormobile laster opened another workshop in Camperdown, right next to the big VW dealer Lanock Motors.
Australian 'factory' campers weren't built in the Melbourne factory' they were converted from completed new Kombis in the Sopru and Dormobile workshops. There were many other 'non-genuine' conversions at that time too, such as Swagman, Trakka and Discoverer. The UK conversions such as Devon weren't sold here, unless you come across a privately imported example.
Yes the T2 Kombis (1968-79) are getting very old and tired now - at best they will be at least 36 years old. The twin-carb 1.8-litre engine was available 1974-75 and had more power than the upright 1600, but parts are unavailable today. The 2000cc twin carb was the standard engine 1976-79 when the 1600 was discontinued. They are good strong engines but the heads eventually give trouble. They only made 51 kW and 137 Nm, so there isn't much performance. None of the conversions had showers or toilets; some of the early gas cooker installs were a bit dodgy by today's standards, and the old Electrolux RAM24 3-way fridges will be very weak now if they work at all. As Barry saysl, the later T3 Kombis are newer, more powerful, drive much better and are rooomier inside. The Austraian approved camper conversion of the T3 was the Trakka and they were a nice conversion.
You might even consider an even later T4 Kombi camper conversion. Again Trakka did camper conversions, bigger, roomier and more home-like than the old T2 and T3s. They had a water tank and electric shower fitting at the rear; still no toilet through. T4s were also used as ambulances, with high fixed roofs and twin sliding doors, and these made excellent camper conversions.
Trakka still convertes the current T5 Kombis, and they are a beautiful but expensive vehicle. The German-built 'California' camper conversion could not be sold here as it did not meet Australian Design Rules.
http://www.trakka.com.au/motorhome-models.php#poptop