Welcome to FT too
With the US Miles you have after re-banking the 200k, you should be able to use 90k for a Business Class seat or 120k for First (if you're intent on spoiling him!) on a RT to Japan on UA.
One nice thing about Award tickets is that dates can be changed without penalty, only subject to availability (which, in an emergency, would mean he could probably standby for the next open seat home).
Best wishes~!