Val,
Many schools that are opposed to grade skipping also oppose subject acceleration. Since your child�s school already provides acceleration in reading and math, they may be more receptive than most to a full grade skip. A full skip usually means less coordination and effort for school personnel.
My daughter skipped from 2nd to 3rd over Thanksgiving break several years ago. She choose the transition time which occurred almost a month after we were told of her eligibility. We have never looked back and I highly recommend it!