I keep a copy of my action plan in the same zip top bag as my EpiPens. Having an action plan with you, and a prominent medical ID bracelet, necklace, etc. Should be sufficient, I would think. Paramedics I have had asked for medical history, to which I just show my MedicAlert bracelet and EpiPens. None of them ever looked at my action plan. Perhaps the passport idea is just that?
My Mum has more medical conditions and has a medical document thing clearly marked (with that logo name mentioned) and hanging on her fridge. It contains a more detailed summary of her current medications, conditions, allergies, etc. You can get them at most pharmacies.