Have you looked at transferring to Korean Air? Seems like they have a good product, and they have very good availability around your dates. It would be 97.5k each way in Biz (or 120k in First).

A few challenges though:
1) Since it is one-way, your booking will have to be all on KE, thus you will need to have a second ticket from a KE US destination (probably ATL or JFK). This is easily done with UR, MR, or BA points/miles.
2) You will have to have an overnight in Seoul or at your US gateway.
3) If you aren't yet married or don't live together, you will have a challenge booking your partner's award.