The "Sydney Connect" idea has already been possible for quite some time, but they never really marketed it or scheduled flights for it. In fact, the shortest-distance route (with 1 stop) between SCL and SIN/HKG is via the east coast of Australia (ignoring Antarctica) but it seems like nobody cares.
Bring QF27/28 3 hours forward, QF5/6 a little back, and instead of having a 747 doing QF127/128, swap for 2x A330s with the new J seats, one flight departing SYD in the morning as per usual, and one in the late afternoon. Pity about the Y+ seats to HKG, but, oh, look, we have a hub!