It's impossible. Google (or Microsoft) will dominate the public education market over the next decade. Apple hardware is simply too expensive for schools. When budgets are as tight as they are for most school districts, the fact that you can get 5 chromebooks for the cost of one MacBook Air means it would be terribly foolish for schools to buy macs.
The chromebooks purchased for our school district run about $287 each. Then they get the all the little things added, three year warranty, white glove, console, ect. Each chromebook ends up costing the school district closer to $400 each to get to the hands of a student.
Apple leases / finances MacBook Airs for three years with the three warranty included, phone support for about $450 each over the same three years. At the end of the three years you have the option of purchasing or swapping out for new one and continue lease.
The total cost is much closer than you would think and would you rather drive a Cadillac for three years or a scooter for the same price.
A chromebook is nothing more than a large screen browser. Sure, some pretty fancy things can be accomplished with our current 'online' workflow, even coding through something like JSBin can be accomplished with a chromebook. But it is much easier with a 'real' computer.
If money is the only concern I would rather school districts / companies purchase 1:1 Dell Inspiron 11 3000 series ( about $179 ) each or Acer Aspire One ( about $159 ) and put Ubuntu on them and manage them via Landscape and drop physical textbook purchases all together.
There would be a huge blowback by teachers and company employees if they were suddenly switched to a new operating system, but the cost savings would be enormous. Slowly migrating the staff over first with plentiful education and explanations of the goals / purposes ( cost, security, cost ) would ease tensions and get buy in.
... pipedream...