Thanks Trout, Thai-Kiwi and LibertyUK.

I haven't spoken to Air NZ and indeed it's like finding needle in a haystack. Around my travel date which is just over 3 months from now, there is absolutely NOTHING on SQ, UA, Lufthansa. There is one F class on Thai Air, but a few days too late for my travel need; I've looked into it previously, Thai Air F class is really like J class for most airlines thesedays with flatbed not available in J Thai.

Even trying to get discounted business fare using AP (stated as one of the perks of being AP HVC) on Air NZ isn't available.

So, I think either trying to juggle the date to redeem THai Air F class or use good o' cash. However, air reward seat is not refundable so I don't think I will risk it.