You might be able to make it work on the front, but the rear is definately a problem. The rear axle are very different, especially how the attach to the rear diff. You might be able to work around this by using the same rear diff that you get the axles from, it will bolt up, be careful to make sure the rear diff ratio is the same as your tranny. That my be that hard part since most of the EJ series cars that I have dealt with, the highest ratio is 3.900, most are 4.111 and some are 4.444. The other part of the rear challenge are the hubs, I'm not sure if they will work or not and I don't have an EA car to look at to see if they would. If you got to my web site http://www.corkysrocks.net/SubaruPage.htm and look under projects, you'll see the conversion that I did about 7 years ago. I was one of the first in the Pacific Northwest to do the conversion and they have been many variation on that conversion by others since then. I realize the hardest part for you is finding XT6 part, if I remember correctly, Subaru did not import that car to Austraila.
I have some friends in Adelaide, some day I need to get down there for a visit.