As far as I know, yes the EFI pump fits the Aussie tank.
You have to drop the tank down. Through the inspection hole in the boot, there is a round fitting in the tank. This is for fuel level gauge only, don't touch that. If you drop the tank down there is another round fitting further forward. The 4A-C spec one has tubes running down in the tank for fuel pickup with a little filter at the bottom. This is the unit the EFI pump and mount replaces, and should bolt in.
But it would be best to change the metal fuel lines under the car to ones with the screw fittings like the factory 4A-GEU spec ones. But, you can just replace all the rubber fuel hose bits with better new stuff, and just hose clamp it.
(I have not done this yet, my pump has not arrived)