It would be very difficult to fit a whole Corolla into the sierra, though you could fit the engine!
People have fitted various Corolla engines to Sierras in the past but it's a fairly complex conversion and you need the RWD gearbox to match which are very expensive and hard to get these days, especially in Broome I'd imagine.
I'd look for a 1.6L Vitara or Baleno engine, they're a straightforward conversion. They bolt it with a cheap adapter plate. There used to be shitloads of Vitaras in Broome, there's got to be some sitting around somewhere.
You could also look for a donor G13bb Jimny or a GTi swift but I imagine both those cars are pretty darn hard to get where you are. I did see a Jimny in the wreckers there a couple of months back but I think that was a VVT M13 model. It's possible to convert to the M13 but it's a lot more work.
Aside from the above, there's no easy/straightforward engine conversion for Sierras.