Not sure if this would work, but could he independently work on Michael Clay Thompson books? My son does this at home by himself. I just "check" that he understands the concepts once a week. Might be a good supplemental idea. Also, I took over writing questions to required reading (I gave). Maybe your dc could work on answering these type questions during phonics.
My ds7 sounds quite similar (in this post) to yours. He could not tolerate the boring grade level (even the high group) work. I did a lot of extra work to help support him, but it has been worth it so far. I think public school is not equipped to challenge kids that are years ahead- and got there with zero instruction.
Good luck. Keep us posted!
