Hi Atacama40 it can be done! I did it earlier this year. First instance is the need to book 350+ days ahead! The two Club World seats to every route are released and ensure you grab LHR-SIN-SYD (NOT straight through LHR-SYD) as this way you can change each of the four legs if / when First opens up. I initially had two of the legs in F and gradually got all four to F.

It is often possible with patience