I'm pleased to report that I have successfully booked *A RTW x 2 in J. Phew!
It took patience, perseverance & flexibility. I made numerous calls to SQ, who were always in Manila. Some calls resulted in HUACA. At one point I was told that I needed to speak with a 'representative', the implication being that maybe they are not all representatives.
Mostly the representatives could not see the availability that I was seeing on United & Aeroplan. Even some flights showing as available on SQ's website with *A partners were unavailable. Eventually it was easier just to select all flights from the SQ site.
The representatives who were familiar with *A RTW were excellent.
I was asked to print up their on line partner request form and email it through. From there we were able to refine availability, airlines & times.
The biggest problem in flight selection, going both east & west, was getting across the Pacific. There was nothing via HND, NRT, INC, TPE, etc, out of JFK, EWR, SEA, LAX, SFO, etc.
Eventually the following trip was booked. ADL-SIN-BOM(SQ); KWI (AI); CAI(MS); IST(MS); VIE(TK); FRA(LH); JFK(SQ); EWR-SIN-SYD (SQ). Final cost was $1,200 pp. The BOM-CAI flight had taxes of $54 pp, but I didn't get a breakdown for the other flights.
Flights out of SYD & MEL were difficult to find, but there was reasonable availability out of ADL.
There was plenty of availability on short haul flights such as MS & TK.
We are able to fly into JFK & out of EWR without incurring an overland segment.
As others have queried previously, we are able to transit SIN twice.
$150 for booking over the phone was not required.
We were able to book all this only 3 months out.
Thank you to all those above for your support.