In my experience, the school will either "get it" or they won't, and the best way to find out is to be honest and straightforward. I visited our local public school when my son was 3 1/2 (he read at 2) to get a sense of the environment there, and they literally laughed at me for going there so early and told me that they wouldn't even screen for giftedness until 3rd grade, let alone offer any kind of accommodations. When I went down the street to a small private school that creates an individualized curriculum for each kid, they told me that accelerating my son was a "no brainer" and that they would happily accept him to start kindergarten at age 4 1/2, with subject acceleration in addition to the early start, which has been a huge success.
