Awesome idea, which is already working and everyone can help to fundrise here.
Just one small thing missing from my point of view: how can we make from this a social business? The idea is there, the technology too, it has already been commercialized… but it depends on the charity of many people, or from a couple of rich ones, to keep existing. And generally, that is not sustainable.
Using the famous sentence of don’t give a man a fish, show him how to fish, the solution to get a pair of shoes to every children passes from teaching them how to make their own shoes. Maybe technology can be exported to those places in Africa where shoes are needed de most? Maybe then you can employ local people and use local material instead of fancy rubber and treated leather?
Next step is to make it profitable (or at least take it to the break even point) and self-sustainable. Charity can help to set up a business, but if it can not fly alone in a couple of years people will move their interest and their wallets to something else, and it will sadly disappear. You can use for instance recycled materials to cut down costs, or set flexible prices according to the location you sell them: cheaper in the poorer villages, medium in more resourcefull cities and overprized to tourist or first-world stores.
Then the impact in the world will be not only to thousands but millions of children.