I did D&T in high school and can offer a slightly different perspective.
you might have good intentions, but you might be bitting off more than you can chew.
first and formost... do you have the means to make a prototype pedal? ie do you have access to a 3d printer?, cnc, mill etc? or a shit load of money to pay people to do it?
IS IT FEASIBLE ?!?!
if your answer to that is yes... then maybe look into ALL clip-in pedal designs and try and take the best of easy design and make your own.
if your answer is no....... look into something else thats bike related.
My mate did a work stand for his major work. Takes it to every race/ride and is something you can actually use! (unlike 99% of the shit people make, but never touch again... myself included lol)
I'm in the process of designing a ceiling mounted bike repair stand, means I dont need to take bike off stand to it flip around. Something I can rotate 360.
dont forget your portfolio has the HUGE chuck of marks.... dont neglect it. If shit hits the fan with your actual project, as long as you have documented your processes, steps, R&D, receipts etc etc you will still do fine in the subject. and FUCKING BACK UP YOUR WORK ON 2 USB's/ to the cloud
Other ideas:
rip off bontragers TLR charger pump?
specific bike tools?
bike specific tool box, with trolley/wheels/drawers/lights/sound system?
phone mount, waterproof it?
lights + mounts?
does your bike have internal routing? rip off park tools magnetic cable routing tool?
it doesn't have to be unique... it just has to be good AND ANSWER YOUR OBJECTIVE.
Good Luck