At one time I wondered whether having him skip P2 and go straight on to P3 might be good. However: he's basically happy with the P1 group; he'd struggle with the writing demands of P3; and he would still be ahead in both reading and maths; so I no longer think that would be a good move at this point.
You are exactly correct in your idea that ND motor skills will slow a child down quite a bit. And that further subject acceleration in Math and reading will probably be needed, but I want to encourage you to 'give it a try' if offered.
I think of it this way. A child doesn't need to struggle in every subject every year. So if the writing becomes a challenge, that uses up some of his 'challenge needs' and will make him more content in Math. If they offer the skip, I would take it, and remind them that if he still needs subject acceleration in Math and Reading, that you are going to still want it. One of the great things abut gradeskips is that the school becomes more 'aware' of your child in a good way, and more willing to 'think outside the box.' So it might be a way to 'open the door' to more individualized planning.
Is partial homeschooling an option? If not, then I think that the challenge of being with older kids might be your 'least worst' option. My son is a 'summer birthday' plus single grade skipped, and although it isn't enough for his 'smart brain' it is more than enough for his 'dumb fingers' and so the combination is a pretty good 'least worst' option. Our son also is ND in the gross and fine motor, if not a bit behind! As far as the emotional maturity goes, I find that he tends to act like whoever he is with. Weirdly, there are activities that I would like to invite him to bring a friend, where I would be horrified to bring one of his age-mate friends, but happy to bring one of his classmates. I'm glad he has so many choices in the friendship department.
My son found that Alex was great at locating new material to learn, and inspiring him to learn it, but that I had to do some teaching to get it in there. I guess I would suggest that they let him continue Alex at school with you teaching the new topics at home and him practicing during school hours. The big problem with elementary school mathmatics is that there is so little 'math' in it. Our 3rd grade is mostly about memorizing the times tables - which is an important skill, and wonderful for streaching the memorizing muscles - but not really math, in my book.
They might be willing to start a recreational math club. Our school got one going in 5th grade, that our son was able to attend as a 4th grader. It totally made his week!
Don't give up. It's amazing how the little things can make a big difference.
Love and More Love,
Grinity
