I have to wonder how well a nasal spray would work with nasal symptoms being part of a reaction. Think of a really snotty reaction; I don't think a spray could be effective then, or when you have congestion from other conditions such as viruses. It will be interesting to see how the trial considers those factors. (They are spraying allergens in the nose and seeing how it affects the epinephrine.)
Sounds like an interesting experiment, for sure.