Originally Posted by
findark
Ah, I was confused since OP has suggested the embedded surface sector in point (2). I don't know offhand, but it would seem a little odd if the RTW ticket is restricted to *A just because of coverage gaps like precisely this, but you very well might be right.
I wasn't able to get ITA to price a RTW itinerary, and the *A RTW tool suggested SYD-SIN-PER when I tried it, so... anecdotal evidence, admittedly.
I'd want to contact an RTW ticketing specialist.