Unfortunately, I can relate and echo what SL said. In a reaction using an EpiPen is difficult enough, if not impossible due to cognitive and physical impairment caused by the reaction itself... And all that can happen within seconds, before you even realise it's time to use Epi. I would never switch to a phial and syringe for that reason alone. I have been down that road too many times - though I was thankfully able to administer my own adrenaline auto injector all but once. Plus, trusting a bystander to use a syringe without any instructions (assuming they even know how to use a syringe properly) could be dangerous if they injected it into the wrong part of the body, gave you an incorrect dose, gave you an air bubble into a vein, etc. And - people trained in first aid will not be trained to use a phial and syringe, only autoinjectors - so the people able to help you if you were unable to help yourself would be limited to medical personnel and possibly diabetics and drug users, both of which use very different injection methods that wouldn't work for adrenaline.
$200 per year (for two autoinjectors) is worth it.
Some things to consider, from someone who has been down that road too many times.