I LOVED Fukuokas books, I have read them all!
That being said, learn from the wife's family FIRST if you can. Starting out a new business can be very tricky, and by listening to your wife's family you will have a market (very important in a new business), and a growing technique that is great for your climate.
This is why it is important: EVERY climate is different! Fukuoka's techniques seem to be fine for my
trees. I have used it for years. Great. BUT! the grain that I planted using his techniques did badly and they looked like they were not getting
enough water. OK, the midwest is more arid than some countries, and I made a mental note that seed balls do badly here. *IF* my income were dependant on the crop I would have been in very deep trouble! Instead I made a mental note:
fruit trees with an understudy of vegetation and minimal pruning do pretty darned well for me, just as they did for him in Japan. But, in the midwest, grain seeds need to be buried so that they can take advantage of the winter moisture stored in the soil.
Climate matters. Some of his techniques might work in the Phillipeans but some of them might fail: do not trust your financial security to his work until you have tried it out in your climate.
By learning from your wife's family you can have a more secure income while you try out his techniqes on a small area. An experienced farmer to learn from is a treasure indeed! Try out Mr. Fukuoka's ideas on a garden-sized plot. Then, incorporate what works for you into the main area of your farm. And, after it works for you, other farmers might be interested (or not, having one's own business means that a person can run it as they wish).