k4b.org
Reading charities exist in every country, most with long names that get shortened awkwardly by everyone who handles them. Kids for books would serve them well.
K4B also reads as knowledge for business, suiting a professional education body or a research organisation serving the private sector, and kits for babies.
The strength of the 4-as-for pattern in the nonprofit sector is that it has become the house style. A programme named this way reads as belonging, which matters when the name appears on a funding application beside a dozen others and has to be remembered afterwards.
Three characters, fixed supply, correct extension.
The name is available. Offers considered.