Hi wvmarle,
Sorry for the late reply, but it doesn’t mean this project didn’t move forward.
I showed it at work, they loved the concept ! So now i need to create the prototype with KiCAD and SeedStudio. As i lever used any of them, i need to get use to it to manage both in a proper way. And when i see on SeedStudio all the parameters possible to put (no of layers, surface finish, minimum solder mask dam...etc...), it might take a bit time 
In parallel, i bought a vibration sensor SW-420, and tried the concept of launching on a plate which will count the pieces.
It’s not really accurate yet, i have some issues with the code, but i’ll see the result i’ll reach.
And let you know of course
See you soon i guess