I did it for his primary and secondary schools, he chose it and he wouldn't complain about the consequence. Double confirm it's your choice or his choice.
Wish you and your son have quality time to build up the relationship.
Since your kid is within the Band 1 zone, I think you really need to consider critically the choices in front of your kid. I also had several discussions with my kid before we registered. On academic side, have you checked with your school what the past allocation results of your kid's primary school. And what are the successful rates of admittance to local universities of the DSS schools offering a place to your kid?