Okay-- in light of that, my advice is to go try door number two. Door number two here is not "acceleration" per se, but COMPACTION of the curriculum, or some method of allowing him (and, er-- other kids if they are in the classroom) the ability to move at a more appropriate pace through the grade-level curriculum.
What that means in a functional sense, of course, is that such students mostly spend the first month of school doing assessments for grades 1, 2... in the subject. Or it might mean that they'll burn through workbooks and reading material at a pace that YOU know is possible, but at least then the teacher (and administrator) will see it, as well.
