My options include:
Homeschool with the help of tutors. Tutors are 45 mile commute and cost as much as a 3-credit community college course -- not including the cost of commuting!
Homeschool and start easing him into community college. That's 20 mile commute and if his first classes are conditional on my attendance, then add the cost of daycare.
Local public high school. This would start him accruing high school credits and, by my calculation, he would end up in community college in 2 - 3 years and this move would force high school graduation by age 14 unless I can talk them into accommodating his slow processing speed with fewer classes / more study hall.
I will have him take the community college math placement test this summer. I should schedule a meeting with the middle/high school principal again.