If there's no award availability ClE-YYZ to get onto CX827, AA should send a private jet to pick up the stranded million-miler!
If you make it onto CX827 on Sunday, you will also have to find yourself a place to stay overnight in HKG, as the flight to BKK, does not go until the next day. Alternately, get an earlier connection to BKK, and find a place to stay there, the night before the BKK-HKT flight.