I’m not sure if this question is best suited here but I’ll give it a go

i need to get from Europe to Melbourne around Xmas 2020 so dates aren’t that relevant I’m just planning ahead.

Lets assume i have enough avios for either a straight redemption in J or multi partner redemption in J. I read that the latter works out much cheaper in the spending avios guide but I can't come up with the optimum route? I was thinking LHR - IST - DOH - BOM - KUL - MEL but it works out too expensive once you add in the return

2nd option is going the American route....

3rd option is book return to HKG or SIN in PE and UUA, then find a direct reward flight return from there?

I'm thinking option 3 is the most economical cash and avios wise?

Edit I also have a stash of OB points...