Yeah importing is near impossible here and costs a fortune, a couple of years back a group in SA lost hundreds of thousands of dollars bringing in fertile eggs because one tested positive for salmonella. Avgen managed to bring in a heap of birds over several years but it cost her millions, she managed to rent a quarantine station in England somewhere which helped her get them in.
It seems that when they relaxed the import ban from the early 1900's they increased the bio-security on bringing birds in so it is only the most hardcore enthusiasts with deep pockets that will give it a try.
The Sumatra are here but Australia has a history of focusing on high production poultry so the ornamental breeds were never seen as worthwhile to those that had the means to bring them in.
Here is some old chats about Junglefowl, there is mention of an import around 2013 but nothing about if it happened or by whom:
http://www.australianpoultryforum.com/viewtopic.php?f=2&t=3796 http://www.australianpoultryforum.com/viewtopic.php?f=6&t=42043