It seems to me that you're going to ned to overnight somewhere. The other routing would be WLG-AKL-HKG-KUL, but you would need to overnight in HKG on the Saturday night (is that a bad thing?). Going back works a bit better: leave KUL at 1:45pm, arr WLG 3:30pm the next day.

Alternatively go as far as SIN on QF and then get one of the MH/SQ shuttles up to KUL.