Home school is a good choice, although it would be difficult in China, due to lack of access to materials and libraries and lack of space in your tiny apartment. Don't worry too much. Kids don't learn that much in American public schools, anyway. They won't be missing much. But they will learn a tremendous amount by experiencing another culture first-hand, being exposed to totally different ways of thinking, seeing how you deal with problems with your waiban, and experiencing bartering for cucumbers in the market.
Experience is the best teacher.