V.M.
I used to teach preschool which is not the same. But here are some thoughts for you.
I would imagine ( and yes this is a generalization) that most teachers like kids and love to see their faces light up when they learn to read or figure out a tough math problem, I doubt they care what fix you choose meds or natural AS LONG AS it works, and you communicate with them and view them as team members.
When you "forget" to give them their pill that day and they are climbing the walls, or if you try to eliminate red dye but only when it's convenient for you, and they are still hitting other kids, trying to wander down to other classroom, making farting noises with their armpits when other classmates are in the middle of show and tell and generally making it hard for others to learn, That's what teachers don't like.
If you meet with them, and have a plan and consequences, and show that you want the best for your child AND are willing to realize your child isn't the only one in the classroom, AND you meet your obligations for dealing with it at home, Then I would assume most teachers will be more than willing to give their all to those special needs kids, n o matter what treatment you chose. Just keep them updated with as much info as they need for time when you adjust the dosage or eliminate a third food group.
again, not a currently practicing professional but HTH