Nah... no chance it would be landing at Seletar. Imagine the headache it would be to secure that area. Not to mention, Seletar can't take an aircraft of that size.
Its not a headache to secure Seletar; its a nightmare for Secret Services to secure that area and the amount of resources needed to compliment for that period of time.It is also a logistical nightmare just to leave and access ino Seletar when the infrastructure are still under development.
It is unimaginable for a head of state of that magnitude to land in that facility.