I share yr concern that is similar to my situation.
I put my son in Kln Tg PN that I would drive him everyday and he will be escorted by maid after school.
I live in very Eastern part and need 30 mins in morning journey.
But it may take 45 mins for taking MTR after school that I cannot drive him. He must fall asleep in this journey.
I would consider trying every KG in Island first because don't want to waste his time.
what about you? applied PN/KG in Kln Tg?