Your first job as an IDer and you want your personal opinion to drive the design? Quite frankly, I can’t think of something more idiotic.
Not to say there isn’t a market for a conspicuous hearing aid. How big of a market is it compared to the inconspicuous market? Is it enough to sustain itself? Once you go down the “fashion” road, how many different lines will be need to support the market? Rugged dude? Dainty dude? Sporto dude? Metro dude?
At this time, you are no where near qualified to answer any of those questions, let alone letting your opinion drive the answers.
If you want to pursue something on your time and not billable time, go at it. I for one would not be pleased having a junior go off script on my dime.