Bagua in Singapore:
Ge Chunyan (Cheng village baguazhang from Sun Zhijun, also teaches wushu, etc.)
Wang Hanzhi (Imperial baguaquan from Gong Baotian -> Wang Zhuangfei (Wang Hanzhi is his son))
Wang Shangxin (Yin style baguazhang from Yin Yuzhang -> Wang Fu)
Zhou Yuewen (Wuji Baguazhang - a rarely-seen form of baguazhang from Shanghai, coming from Yin Fu -> Cui Zhendong -> Ji Jinshan; also teaches many other things)
As for taiji, there are many, including:
Zhu Tiancai (Chen village)
Xu Jinge (Yang style from Dong Yingjie -> Lin Boyan, Chen style via Zhu Tiancai, Praying Mantis via Luo Guangyu -> Lin Boyan)
Not all of the above teach publically...
As for Geylang - don't play too much over there!
(Feel free to eat the durians and mangosteens, though.)