If a cadet scheme is open to the whole world, you can expect the competition to be fierce.
You should apply for the Aussie schemes. If you don't get them. You have a choice, give up or find your own way to become a pilot. If you really want it you'll find a way of raising the money. I'd say the overwhelming majority of pilots had to pay their own way, whether by loan or saving.
It's the first test of your real desire to be a pilot. Raising the cash.
If you rely on a cadet scheme to come along, you might find yourself waiting forever.