My son was diagnosed a few weeks after he started pre-school. Like others have said, we met with the teachers, prepared school boxes, gave written instructions, etc. Before the second year of pre-school, we met with the teachers again and did pump training. (Be patient about getting a pump. It won't be easy to use until the honeymoon diminishes. Then, it'll be worth the wait.) You may want to consider a mid-year refresher training as it's easy for people to become a little complacent.
I read a funny book called My Life as a Pancreas. The author mom goes into her son's class every year. So, for our second year of pre-school, we first wrote a letter to the parents (approved by the teachers) about our son's diabetes and about birthday snacks. (The teachers try to let us know about the snacks in advance, so we can plan for them.)
We also went in and read the kids a story and showed them Rufus, our son's pump, etc.
None of them had any questions (too little) and they don't even pay
much attention to it. The kids at your son's school will no doubt be great.
We were very nervous about Safety Town and about Kindergarten in the fall. But, we're meeting with folks, training them, planning early, etc. People who work in schools choose to do so, because they care about kids. I'm so glad that your school is being so great!
My son was diagnosed October of the year before Kindergarden, he is now finishing 1st grade. I was a complete basket of NERVES when he began kindergarten. We also decided to go to the pump before he started school. I was able to work thru anxiety by meeting with the principal of the school, addressing my concerns, which it sounds like you have done since you have been able to speak with the school nurse. I also met with the school nurse, but in our school the nurses are between so many schools they are onl there a day or two a week, the teachers have to attend a diabetes training which the school system funds when a diabetic student is identified in the class. I was glad that was done the summer prior to my son beginning school. I work full time and my husband as well, so part time school was not an option. We are both flexible, so were receivng phone calls ALOT from teachers as well as TO teachers from us. We were running by the school atleast a few times a week to double check on things to calm our nerves. We live and work a few blocks away from the school, so that was truely a blessing.
You have much more insight than I did about educating his class, I left that to the school counselor, because my son also got very angry if I told anyone he was diabetic. I wish I had been at the class when the counselor advised his classmates about his condition, but I was not emotionally able to do that without crying my eyes out. There are some great books out there dedicated to the purpose of helping little ones understand diabetes; while also empowering your son as the "diabetes educator" in his class. One thing our son has encountered is other children thinking that they can "catch" diabetes from him. While heart breaking, it's an opporunity for education of the other students and empowerment for my son to help them understand.