I completely understand your hesitation to embrace a teacher with a reputation of inflexibility. When my son was in elementary school, the principal hand-picked the teachers for all students with IEPs, to ensure as good a fit as possible. My input was welcomed on that as well. Hopefully, the principal will either work with you on a change or support the decision to leave your son in this teacher’s class (maybe she is the best fit for him of all the 4th grade teachers).
You can certainly embrace the final decision and make the best of it. Here are some strategies for effectively working with teachers:
ADDitude Community Moderator, Author & Mentor on Parenting ADHD, Mom to teen w/ ADHD, LDs, and autism