Since the HND-DOH JAL flight departs over two hours earlier (just!) than the QR flight was scheduled to, I was able to change my (award) ticket to depart on the QR flight from KIX (more convenient for me, and better onward connection in DOH), without any question. I called the Plat line, although my Plat status is in its death throes, not having earned any Qpoints over the last eighteen months!