Looking for help/suggestions for one way TPAC flight in C

Dear club,

I am looking for an advice/suggestions/recommendations to book one way award SFO-SIN flight in mid June for my wife.

Here is the situation - my wife does not handle quite well >10h flights in Y so I am trying to book saver award in the route. Unfortunately paying standard award miles is not an option - I simply do not have that amount of miles.

So the standard SFO-SIN route is either SFO-NRT-SIN or SFO-HKG-SIN. No C saver award is available on those routes. The same situation is if departure airport is PDX/LAX/SEA.

Other single connection option is with TPE or ICN, but no luck either with UA's website or with ANA tool.

So I've tried to expand the search with two connections max and try it on either directions - west or east. On eastwards connection options are:

SFO-FRA-SIN
SFO-ZRH-SIN

For the first option, there are three direct flights but only UA's flights are showing up, on UA's website. for the second option, there is a direct flight on LX which shows up on ANA's tool but on on UA's site. No saver seats on either route are available for the whole month of June.

Then I expanded the search to:
SFO-LAX-IST-SIN via UA on SFO-LAX, TK on LAX-IST leg and SQ/TK from IST
SFO-ORD-IST-SIN, as above
SFO-ICH-SIN
SFO-TPE-SIN

No luck whatsoever.

Any recommendations what to do and in which direction to take this search? Does it make any sense to wait more?

I am running out of options.