That sounds really exciting!
Do you have some examples of work that you are looking at doing and how the Tableau Community could help you?
Pete Misner shows the type of this educators would like: Grassroots Data Analysis Drives Elementary School Principal Leadership | Tableau Software and https://public.tableau.com/profile/k12learninganalytics#!/
Again, I am not sure what you needed help with?
You have provided some good examples - I even note that you posted here also:
I note a number of users in that forum have created some inspirational stuff that might be worth looking at - it looks like they may even be interested in being contacted also.
To start with - have you tried drawing out some data or some drawings of what you are trying to do, along with creating some mock data to showcase what you are after?
From some of the keywords you have provided - student learning, student achievement, diagnostic feedback, improve performance. What would that look like for you? In your case, maybe you might want to lead the way as you probably know more about your subject matter than anyone else you are looking for