I agree with MON and others who said that the PT conference is not the place for decisions, though it is unfortunate that you've already asked for change and nothing has been done. If nothing happens at the conference (as predicted), mention to the teacher at the end that you plan to schedule a meeting so you can discuss plans going forward.
I had a teacher pleaser too, and the only thing that really helped us was that we came to the school before it started with IQ scores showing that our kiddo was really unusual. This prompted them to test them on their own achievement tests. The only test that really convinced them to do anything was the NWEA MAP test, which showed that our DS, when 5, would have passed the state 3rd grade state tests. If your school uses the MAP, it is an awesome test for comparing what your kid knows with kids in other grades, and that really means something to the teachers. (If your kindergartner is doing as well as most of the 2nd graders, teachers get that.)
Another thing you could do is bring in your kiddo's current books he is reading or examples of math he likes to do at home. And mention that your kiddo is unhappy - kindergarten students are supposed to like going to school. When I mentioned how my son cried every day before kindergarten, not wanting to go, the teacher wanted to do something to help.
Good luck.
