Note that many Asian carriers only do round trip redemptions.

I have a J trip to DAD at around that time on KE (ticketed through AS) but they only do RTs. It was 120k miles. Unfortunately you can't transfer to AS.

I would check the Asian carriers for sure. ANA has a very good chart and they are an amex partner. RT only. I'm not sure if KE is partners with any of those. You can book KE through DL; I'm not sure how many skypesos that would cost though.

If there's JL availability you may be able to transfer to BA and book it that way. They do one ways.

And EK is an Amex partner. Not the most efficient routing but it's a good product. I have flown them back from Asia before (when they were an AS partner)

Be willing to reposition within the US, possibly on your own dime.

ETA: And of course SQ is good but their premium partner award availability is not good. Can you transfer to them?