I'd say a form of spatulata. The leaves and stipules definitely don't match ultramafica, nor the hybrid.
Everything has a reason, whether big or small. Never underestimate the power of what is or is not.
There is far more to everything than meets the eye.
Ah, rats. I had thought that I might have something rare on my hands. Oh well.
The plants came with flower stalks, but the flowers had withered before I had an opportunity to photograph them. I'll wait for them to flower to take some images. Feeding a pinhead cricket to a plant might trigger flowering as it did for one of my the other D. spatulata.
I assume since you are in SG, you have "lowland" conditions? How are the they adapting?
They are being grown in an airconditioned room where the temperature rarely goes above 25 degrees C, and they are doing quite well.