Reasonable Requests for a Gifted 2nd Grader

Edit to Add: Wow! I’m blown away by all the thoughtful responses here. Thank you so much. I’ll try to respond to everyone, but if I miss some, please know your advice has been greatly appreciated. 🙏🏼

I have a second grader whose reading comprehension is at the 12 grade level. He has been refusing to participate in his class’s daily phonics/literacy lessons, with the result being that his recess is taken away almost daily. This cycle isn’t going well.

We had him evaluated by a pediatric neuropsychiatrist a few months ago (initially suspecting adhd). After 8 hours of testing, the doctor concluded in a written report that he is struggling in the classroom because he is highly gifted and very bored/frustrated. The doctor recommended “differentiated learning opportunities” within the normal classroom to provide him with more stimulation.

I realize my son’s teacher must be absolutely swamped trying to cater to the needs of so many differently abled children, but I really feel we need to try something new at school.

What are some reasonable options for differentiated learning during phonics/literacy time that I could recommend to his teacher? What could he do that would provide him more stimulation but not disrupt/distract the other kids?