You'll want to at least consider a way of adjusting the front-rear brake bias.

Factory brakes are almost always designed so the fronts lock up just the tiniest bit earlier than the rears. This provides the quickest stops while maintaining stability.

If you increase braking power of the fronts only, you lengthen the stopping distance. This is fact, not opinion.

An adjustable proportioning valve will permit you to reduce the effectiveness of the front brakes back to where it needs to be. I understand the need for using available spares in Oz, but beware of increasing the pad area and/or clamping force on one end of the car only. Improving stopping distance simply doesn't work that way.