Successfully interlined from JL to QR, separate reservations.
HND-BKK on JL Y
BKK-DOH on QR C
I had DOH-LAX a few hours after, but with a 13 hour layover at BKK, the DOH-LAX date became too far in the future for them to interline on that flight. QR staff at BKK took care of it, though.