Developing trauma informed classrooms is actually a pretty significant paradigm shift that goes against a lot of things in mainstream culture. It is less about ACES and more about how a brain responds under stress. It requires some systemic changes as well. I'm guessing you already know this, but growing an awareness of resilience windows and the prevalence of (not helpful) contingency models is more important, I think than ACES.
Another thing that is hard structurally is the importance of skill building, repair and reentry....over and over again. In our partner schools "becoming trauma informed" is a 3 year process.