Assuming that you are going Pacific first to get to the US and then Atlantic to Europe on the DONE 4, you could route from LHR to BAH and pick up the CX 732 or 730 to HKG. If it is the 732 then find out where it stops (Dubai or Riyadh because that might be worth a coupon split and stay on board. You get more status points going via BAH than direct LHR to SIN/BKK/HKG and home. Never book straight through to SYD as getting off and getting back on the same aircraft (even if you have to split to the BA codeshare half) will increase the status points. The flight from London would be BA Club flat bed, a day flight and connects reasonably well to the CX 732/0.

Remember that your coupons are valuable. I would consider buying a LON-FRA separately as you can pick them up cheaply. Remember that LGW to FRA is often cheaper than LHR to FRA. Should you *A as well, you could book on flybmi.com as they can be very competitive with 1W.

If you are DONE4ing then I will have another think about the European sectors for you when you have decided if you are routing this way.

May the status points be with you...