You might find out that doing what you say is much harder to do than you think. Why would a company produce said equipment? The only reason why a company would take your design is only if it is easily integrated and hard to create or very time consuming. For instance, PID control for use with BLDC motors is not very easy to achieve otherwise everyone would be using BLDCs instead of steppers. In this instance, to make a PID control using your favorite MCU would take literally months to design. So, a company would be more willing to buy the chip ready programmed because the time just vanishes as long as the integration process is fairly quick (i.e. the learning curve to use said chip is not long). I do not think a company would manufacture the equipment without changing the equipment in some way, as well. So, if all else, they might offer you a job to perform at their company, but why not just apply with a resume? The whole point is that if you want to do something with a product you have to be willing to create it yourself. That also means that you can farm out all the necessary skills to board houses, machine shops, and all the other necessary people.