Great idea. We lived overseas in Europe for 2 years when my kids were a bit younger (starting at ages 4 and 7), and it was, overall, a great, life-enhancing experience. I worked there, which was VERY helpful in integration. Some spouses of coworkers did not enjoy their time there because of a combination of boredom, loneliness, and culture shock. I definitely agree with the idea of finding something meaningful to do, though I think it could be very difficult. Though perhaps not so much since it's your home country.
Do it sooner rather than later - I think most things are easier when kids are younger. I'd love to to take a trip like this again, but am wary now that the kids are older...