I realize that districts vary and you are most familiar with yours. However, I have navigated my oldest through high school and he has multiple medical issues and learning disabilities. I have found that sometimes it pays to simply ignore their rules/procedures and proceed on the assumption that it is necessary for them to do what you are requesting. Meet with the counselor and administrator over the summer well before school starts and strongly request. You may be surprised by all the decisions that get made or reverse during the summer.
Based on your prior postings, I really think that it is important for your DS to stay in honor courses for math and science.
