Just for fun, I threw together a possible DONE4 ex-OSL that I believe should hit at least 20k BA nTP .. plus, it includes AA overwater segment thus can be ticketed by AA RTW desk.

OSL-DOH QR
DOH-LHR-BOS QR-AA
(insert up to 4 N.A. segments on AS/AA)
DFW-SYD QF
SYD-HND JL
HND-BKK JL
BKK-HND-SIN JL
SIN-HND-CDG JL
CDG-DOH-OSL QR