There is market for sure for this. The question is if you are ready pay the price. I assume, you need huge size 2 layer pcb with components on one side only wit

There is market for sure for this. The question is if you are ready pay the price. I assume, you need huge size 2 layer pcb with components on one side only with wide tracks. Aligning all these buttons would take a day (5 minutes*105). It would take another day to create footprints and prepare components. Another half day to sort things with MCU and at least half day for communication overhead with client. And a day of communication with different pcb manufacturers/assembly houses. A week for a very simple project. If something is not clear with MCU, add second week. Hardware cycles are very different than software. One can write plenty of code in 2 weeks and ship it. In hardware world 2 weeks is a short warm-up phase.