I read once about someone who found a grad student at same school, I think it was a Colorado school, to take up the coaching and paid them.
Someone on the boards mentioned an aunt having the right skill set–and the trust of the kid, because I believe she may have started coaching him in high school.
I think kids tune out parents in this role, but might agree to having someone else in their lives follow-up on executive function items.
My niece applied to the Shire scholarship for one free year of coaching, but they only pick one winner per state and it is a real long shot to be that one. However, someone in your son’s life with patience and intuition might do the trick.