Sounds like MNKD pumping itself off the EpiPen bad PR due to Mylan's price gouging. This issue will slide away as the generics hit the shelves.
MNKD would have to take such a device through full clinical testing, and this would neither be cheap nor quick.
And there are obvious issues. One of the common symptoms of anaphlatic shock is extreme difficulty breathing in various ways. Even worse, the person may be unconscious. Does this not make an inhaler a bit of a problem?
And epipens work in under a minute, so there no "rapid acting" claim to be made by use of technosphere technology.