Your suggestion of not including your FF# used to work, but not any more. Now they will give you an adjustment to your Lifetime SC's but not add them to the current year if the flight was taken in the previous membership year. I think QF is catching on to some of the tricks used in the past.

The only sure way is to travel a few days later.

Is there an AA or BA codeshare on the same flight? Perhaps by booking the codeshare you may get the points posting delayed by a few days.