Sounds like a fine plan to me, seat choice should be fine.

I assume the 320TPs will be for a 40+120+120+40 or 120+40+40+120

Two ex-EU flights in Club and then a Club World Return (unless going direct to Sydney which gives a little more) Or maybe two OneWorld biz flights at your holiday destination.

Minimum TP score from a UK domestic for Euro Trav will be 5tps each way.

So just the question on wether you're expecting 320tps of a single club world return which I do not think is correct.