First world problem here but hoping the wisdom on this board can help. I’m a Oneworld flyer but will be flying SQ paid First (F RBD) RT SYD-SIN-FRA-JFK in August - approx $20k AUD=18k SGD. Was longtime PPS through work travel from 2002-23 but since leaving that role dropped through the tiers and currently KF*S - and that will be gone by date of flight. My partner also travelling on this trip has no status on *A either and has the same question. I realise this itinerary will fall short of PPS as unlikely to do other SQ travel this year, so looking for best way I can gain *Gold ideally with a carrier whose miles don’t expire on a fixed term. In the past through the PPS double dipping I had *G on BD, LH, NZ, A3 and then TK, but these carriers either disappeared or made it much harder with own metal requirements.

So question is which programs earn *G from this flying 28k miles in first on SQ metal and of them, which have the best F class earning and most valuable/longest expiring redemption miles? I think I could get *G on SQ itself, but the miles do expire there and so looking for alternatives. I also do have multiple oneworld status (QF CL, LTP, BA Gold, AA Plat) if carriers are open to status matches, but can’t really see the point if flying would gain *G anyway.

(1) What is your home airport? SYD
(2) What types of fares do you usually buy ? Highest cabin available - plus an Aone5 (First class oneworld RTW) each year.
(3) How many miles do you usually fly each year? 100k+ but mostly on oneworld due to company policy and existing status.
(4) Do you have any kind of status at present? What is it? Not on *A
(5) What is most important to you in a FFP? Mainly IRROP handling and Value of RDMs/access to redemption inventory, but I would find *G helpful for things like intra europe/US shorthauls.
(6) Which routes do you fly most often SYD-LHR, SYD-LAX, SYD-NZ, many domestic Aus, a few intra europe and US shorthauls
(7) Preferred Airlines I love the SQ F product which is why I am booking this ticket rather my usual QF, EK, BA, AA First etc.
(8) Do you travel for work or pleasure? These days 30% work, 70% pleasure. I have considered the *A RTW product but there are not enough carriers with F class to really make it work, plus rules a bit more restrictive than OW. But happy to take advice on that too.