It would make more sense to sell this as an NFT if it were paired with a thematically related artwork. A wealthy buyer would be able to display the NFT in their home and brag about all the lives they saved when they bought it.
At least when I bought a beanie baby, I got beanie baby. NFTs always felt like paying money, then printing up the first picture of a beanie baby from a Google image search, and then trying to convince yourself that had the only one.
There will be virtual worlds where only the true owner of the NFT (can prove with digital signature) can display their artwork. It's not so different from people flexing with their skins in various games, so I don't think it's much of a stretch to imagine a virtual world where people have virtual properties, houses, businesses, etc. where they display their NFT artwork. Have a look at Decentraland for an idea of where this might be heading.
Good idea, and one I hope yet another decent charity uses. And frankly its waaaay more PR friendly than 'a report on our spending effectiveness'.