I feel like you could get a lot more quality of life improvement for more people with the money if you spent it on low tech solutions, eg more efficient cooking stoves for people still cooking with biomass, or solar microgrids for areas without electricity.

No doubt there are a hundred more direct things one could do. On the other hand this would include instructions for all those things and could advise on the building! I think it would be a nice thing to have in the world.