Qantas award availability is now searchable using AA.com, and since you're flying in 2014, it's highly likely that by then CX award inventory might be searchable there as well. Might or might not be available to AS mileage redeemers, but it would be an excellent place to start.
Also (let us pray) AS might get off the dime and allow multiple-carrier awards by then, e.g. Qantas out, CX back or some such, which would be a breakthrough of gigantic proportions.