Epi-pens deliver a cheap drug via a cheap (the price of a ball-point pen) plastic device. Back when they cost $50. apiece the company was already making obscene profits. I’m not sure what it costs now, but not long ago a vial of epinephrine was cheap - I mean REALLY cheap. For under $20. you could get a vial (enough for several injections) and a handful of syringes, park them in the school refrigerator and be all set until the expiration date (several months, maybe years). That would be the passive, low cost solution.
The more fun and creative response might be to raise a little money (we might be surprised at how little it would take), begin manufacturing an epi-pen equivalent. Prior to announcing that you were going to flood the market, let your initial investors know so that they could short the Mylan stock. After recouping their investment, take the profits and buy out the company for 20 cents on the dollar, fire the management and turn the company into a private non-profit. Use the profits from that company to drive down the price of other generic drugs (which Mylan is one of the largest manufacturers of) and lobby for a single-payer health system. Picketing and protesting is fine and good, but sort of like showing up with a knife to a gunfight.