I just got an e-mail from A+ flagging Red Hot Room rates available for Swissotel The Stamford Singapore through to the 23rd Dec. I can't see any with a quick look... but might be worth checking your dates against this, if you are able to lock something in
EDIT: Just found when looking via the app instead of on my PC browser. Example rates early December of SGD$283.80++ per night for Premier Marina Bay King room (you'd need platinum for L65 access with this one)... or an Executive King room with L65 access at SGD$355.80++ per night (no Marina Bay view guaranteed with this... but you're getting it when you want in the club)