Qantas Flight Simulator Experience Sydney
they may be able to tailor a package to include the CX interview profile, then it wont be the first time you will have seen it.
To be honest don't worry about it being a 747 sim, all you really use is the yolk, rudders, thrust levers, flaps, gear and trim. It is just a plane like any other. Even an hour in a sim will help giving you an idea of inertia, biggest hurdle.