I am no expert as I am still trying to figure out things for my own child but have you done any developmental vision testing?
My son is ADHD and they suspect Dysgraphia but he recently began telling me about how things were moving on the page like numbers switching places or + sign changing in to x sign for math. We are still finishing testing but when I saw how he responded to having certain parts of testing I thought it VERY similar to how he responds to schoolwork. I don't yet know how much is related to vision issues but it seemed clear that part of his "stubbornness" was really about his eyes not working well enough to do his work. It is a bit unpredictable with sometimes less vision issues that others. Maybe this is something to look in to for your son? It certainly wouldn't hurt to rule it out if it is making the prospect of homeschool more difficult.
I have read that "Convergence Insufficiency" is 3xs more common in ADD/ADHD children and it fits my son's symptoms. Others on this forum recommended seeing a COVD (developmental) optometrist and that set me learning about this.
Best wishes in your decision. It sounds like this is an important decision point for your son.
