JFC on a stick. Here's a few reasons why this is assenine.
10 years ago implementers tried to stick blockchain into everything. It flopped over and over again. It's simply not practical for 99% of what humanitarian assistance does.
USAID programs and budget and spending was all FOIAable and heavily audited public record. Do you want to see the invoices submitted for all programs in Malawi from 2018? You used to be able to get that. Annual reports showed detailed budgets. Presentations to Congress presented detailed budget documents. Top to bottom this was already more detailed than a blockchain can realistically provide. They broke a system because they couldn't understand the difference between dense and detailed but visible, and impractical EILI5 level simplicity.
So you put the transactions on a chain. Great. How does that turn into a salary payment for Malawian staff who only have Malawian bank accounts? It doesn't. So now you have 2 systems. Meaning twice as much opportunity for error and chance for fraud to go unrecognized.
Most developing world fraud is things that look like perfectly reasonable procurements where the terms of the tender are overly specific as to limit who can win a bid (see Oklahoma school bible solicicitation). Blockchains don't correct for that. That's all public information in most places, which is why the fraud has to be so clever.
Cool beans.