This sounds like a really cool project - Getting kids involved in coding could really boost their options for education and jobs later in life. Having worked for non-profits, I have seen money for youth education programs go to waste but now as a coder I really think that the kids that actually like it and want to get involved could really have their life trajectory change for the better.
I find this to be particularly interesting. While I agree, yes, these kids need some form of computers, from what it sounds like, you're choosing to use Mac Mini's. These are pretty high-cost computers, with much cheaper alternatives. Why not use a cheaper alternative?
Computers are now part of basic literacy and ensuring all students have consistent access to them should be an absolute top priority for all school districts. If we can get students coding at a young age, even better!
Any person that wants to learn to program should be given the opportunity and tools to do so, regardless of background. And, believe it or not, those tools do not stop at pencil and paper. Go SWOT!