I don't like being seen as the pushy parent but I guess that's who we are going to have to be to get results.
Having the teacher advocate for your child is huge. My bet is that you won't have to push hard for too long-- once they see your child happy and succeeding in the new placement, those who were reluctant will probably get on board. (After all, it does tend to raise their test scores to have kids working at their capability level.)
We have seen over the years more and more buy-in, more and more recognition of what our kid needs and what he can do. For us, it has gotten easier, and we have to push less. (Still have to organize, but not push as much.)
Congrats,
DeeDee