It's very encouraging to know that you walked similar path as mine. I hope my son will have a happy, balanced and healthy childhood that will benefit his life.
Frankly speaking, it is no point to have a lot of certificate for interview. It is more important to focus and have one certificate to show the kid is at least 2-3 years better than other at the same age.
My boy will have 25 points. He is also in K1 right now. I also take the same approach as you. I just let him take courses or interest classes according to his interests and ability. I want him to build up his interests in studying but I don't want to push him to his limits yet. So far, he is quite autonomous in learning things and reading books etc. I am so pleased.