Then it's risky, if there's flights available for immediate confirmation then you have to waitlist. You don't seem to have enough miles to do that.
I see. Unless you're flying on staff rates, I don't see why they would refuse to credit your miles. I'm sure you know HKG inside out by now

Which is better, The Pier or The Wing? I still can't reach a definitive conclusion :/
It's LHR you're talking about. It's notorious for the ridiculous APD. Flying to Europe and taking a domestic flight/train is better.
Strongly recommend redeeming at least the return segment on LH F, so you can try out the FRA FCT. It's incredible
Depending on the destination, you can consider Lifemiles or Avios too. Alternatively you could calculate the YQ involved, and if it's not too bad you can wait till after 23 Mar to issue the ticket. This way you have more time to accumulate those miles you need.