No harm trying to waitlist.
Last May I redeemed 2 BC saver SIN-FRA with the 3rd on waitlist, and I got the redemption 2 weeks before departure. 2 years ago I pulled the same trick to Osaka, I got the ticket 1 week before departure. Just recently I tried SIN-CHC, the 3rd one was successful in mid-Jan for my flight in March.