i'm american, but not a parent.
i moved between int'l and local schools when i was studying in singapore (for both pri and secondary levels).
my first contact with the local system was in primary 2, and i remembered i enjoyed it for the most part.
i settled into the local system eventually (i got put into an int'l school again after primary education) and liked it better than the alternative.
scholastically, local schools rule and the system prepared me well to cope with university and life in general.
some local schools also do well in "non-academic areas", and the creativity part may be less of a problem these days.
in retrospect, strict is good. i had too much freedom in
International Schools and was always up to no good.
this shouldn't be a problem at lower primary levels. since you're in singapore for only 2 years, i recommend giving the singapore education system a chance.
i guarantee it wouldn't have any permanent adverse effects on your child.