It could be a system like sponsoring a poor child now through Christian aid, but a whole family. I’d only go along if there was thorough vetting - no addicts, no abusive individuals or criminals. And if entirely voluntary, not mandated by the state like EITC today.
I think the idea of setting up a program to do this is important, because if individuals do it, there is too much room for abuse (i.e., grifters deciding that they’ll get a free ride). The existing programs that do this work very well, and while you know about the family or the child you are helping, and can have contact with them, it all goes through a third-party system that watches for fraud or abuse.