There are thousands of people out there who carry IM Glucagon kits, an similarly time sensitive medication, intended to be administered by untrained bystanders.

There are thousands of people out there who carry IM Glucagon kits, an similarly time sensitive medication, intended to be administered by untrained bystanders. If it works for Glucagon, I see no reason it can't work for Epinephrine. In reality, there's no need for a vial, the syringe can be prefilled with the correct dose.