I don't have a son but I certainly would make him wear diapers full time and never potty train him.
I would dress him like Diaper Boy Tommy below and not allow him to wear pants at home and take him in public in just a diaper and shirt as well.
My neighbor has an 8 year old son that wears diapers all the time and he's always outside in warm and hot weather wearing just his diaper and shirt and shoes or just his diaper and he's very happy.
He wears a size 7 Gentle Steps diaper and he looks so cute in them.
Diapers are more comfortable and feel great when wet or poopy and they are much better than holding it and having to run to the toilet or find a toilet.
All kids should remain in diapers no matter the age.