My thoughts on this is you should diaper punish your son.
Diaper Punishing your son keeps your son under your control and will make him even sweeter.
You should keep your son in diapers all the time and not let him use the toilet.
He should use the diapers for both poop and pee and you change him.
You should also bathe him yourself and change his diapers for him and give him a pacifier, bottle etc.
Have him sit in a highchair when he eats as well and when at home make him wear just the diaper and shirt and socks without any pants or just a diaper.
This way you can tell he's keeping his diaper on and know when he needs a diaper change.
Wearing no pants or shorts over the diaper also makes it easier for diaper changes too.