Congratulations on your impending unemployment
Okay so getting to gold - you need 360 SC. Do you already have 4 sectors up?
If you do family pooling, then you will only need 180SC each if she pools to you, but she can't pool her eligible sectors to you, only her SC. 180 SC each is 90SC each way.
How about SYD-SIN in PE for 90SC each way? That's all of your 360. But remember, only do it this way if you already have 2 of your 4 sectors up.
Or SYD-NAN in J for 80SC each way? That gets you 320 of your 360, then you'd need something small locally to top it up.
EDIT : Hmmmmmm just remembered, SQ don't offer PE around here do they? But basically google a mapping program online, and draw a radius of 3,000 miles around Sydney, and fly somewhere close to that in PE and you're at 90SC according to the earning tables. Don't know where you can fly PE in the 3000-5000 mile range, but that's the sweet spot for the numbers you need.
Depends how much money you have to burn, but for numbers like that I'd either be having a mid-haul holiday with the missus in a higher cabin than Y, or if I wanted to go solo I'd be jumping on a discount economy flight to LAX and then flying first class on Delta in the US for your status run.