We are having the same issue with my son who is now in 3rd grade. Verbally and visually/spatially he's off the charts, but he's been diagnosed with dysgraphia and adhd.

I fought hard for it, since he's in a private school, but we're opting to go for putting him at his level of ability and making accommodations for his disabilities. We have purchased a laptop and he uses it for most of his assignments. Assignments that can't be done on the computer are either scribed (he dictates and someone writes for him) or if it's an actual WRITING assignment, then he writes. He's been learning cursive which has been easier for him, but he still struggles.