The MPM is exactly that - you can't exceed 22000, down to the mile.
From the fare rules:
FL.FLT APPLICATION NOTE - THE TOTAL JOURNEY MUST NOT EXCEED AN MPM OF - - ACIR22/DCIR22/LCIR22 22000 ACIR26/DCIR26/LCIR26 26000 ACIR29SA/DCIR29SA/LCIR29SA 29000 - SURCHARGE TABLES ARE NOT PERMITTED - NOT EXCEED A TOTAL OF 16 SEGMENTS INCLUDING SURFACE SEGMENTS BETWEEN ANY 2 AIRPORTS.
Consider swapping SYD for BNE perhaps as your AU entry/exit point? That is below 22000.
BNE is a good option, will look into it. Otherwise I'll into the 26 and throw in a less direct route and a few extra stops via KUL or such.