I've been playing around with this for a couple weeks, and I really want to get it booked. I'm running into no end of issues.

Itinerary for 2 people:
December 27 YYZ-SIN
January 4 or 5: SIN-YVR (or SFO, SIN-YVR seems way cheaper)

At most one stop in each direction.
Paid J. Every segment must be in J.

I'm seeing lots of issues with the non-AC connections within Asia having no low J space (the P fares seem to book OZ/SQ in D I believe), and on codeshares, putting me in Y.

Absolute upper limit on cost is $4500 USD per person.

There are qualification reasons to book this on an AC ticket. BR has a reasonable fare (about 4200 per person), but it won't earn any AQD, and the cost savings is not enough for me to abandon my hope of booking on AC (yet).

Ironically, if I can't find a reasonable P fare, there's some reward availability that would be decent (though not perfect, otherwise I would have booked it already), meaning AC would lose out on a lot of money.

Thanks