To answer your question, probably not.
Sorry.
Depending on your state, there may be state policies requiring individual districts to maintain full grade and subject acc policies. Now - that a district chooses to do nothing with them is a different battle. But I am first curious whether - your state supports your schools belief that they do not need to evaluate for full grade acc.
Now you write your district is implying who may have the final word - but on most such policies - there is a required appeal process. I'm horrid at the soft approach that builds for better long-term relationships but I just don't see this as over based purely on policy and how your district's board would like policy implemented to match.
You lost a battle - get an ice pack, a shield, and suit back up.
Today. Ice Cream. Tomorrow...
Yes, this totally! And that book will help you do this.