k4o.org
Nature deficit, school outdoor programmes and youth conservation work all attract funding, and the organisations running them are local nonprofits with exactly the naming problem a short domain solves.
K4O reads as kids for outdoors, knowledge for others, or kits for orphans.
The 4-as-for convention is standard in this sector for a practical reason: it produces names fitting on a T-shirt, a minibus, a banner and a funding application, surviving being said once at a community meeting. Three characters is the shortest form of that.
Fixed supply, matching extension, established convention.
The name is available. Enquiries welcome.