Today's DM agent said the ticket would not be reissued until taken over by agents in Singapore. She said this can happen quickly at the end of the 24 hour protected refund period but at times it can take longer. She pushed this point to encourage me to avoid any risk as the reissue could happen 'at any moment'.
I am a long term SWU users (with EF) so I know something about finding OP inventory though the clock would be ticking if things go south on my trip to Beijing.