Is there another lounge in DRW besides Qantas? VA used to have one, and the Catalina Lounge is apparently closed now.
I guess SQ can't or won't spearhead exclusively to reopen the Catalina, and maybe they don't want to cut a deal with Qantas. I suppose there could be some sort of exclusive ground experience they could do that's not in a lounge, e.g. involving a roped off area, or give vouchers to use in the airport, even if it is just for J and PPS pax (no Star Alliance, KrisFlyer Gold or VA elites).