Even if you homeschool a five years old things may change before graduation. I keep seeing k-12 virtual public school advertised. There are things called umbrella schools that are little co-ops of homeschoolers, I believe with a licensed registered teacher. AFAIK the colleges don't look at anything earlier than the ninth grade. You could homeschool until then. Foreign exchange during highschool is one thought. We're likely to have to figure something out before college age, you and me both. Seems like somewhere between ages 8-16 parents start looking for outside mentors, tutors, classes, or something.
If you have a pg kid you could apply for DYS and then you have like a guidance counselor to help.

-I have a 4 yr old & a 1 yr old. I'm not the voice of experience.

Youth lives by personality, age lives by calculation. -- Aristotle on a calendar