Stern didn’t invest time, money, and resources into this project to put it where nobody is going to see it or notice it. They want people to see it and use it.
The coin door is for coins. Putting anything else there would be pointless at best and confusing at worst.
It’s an idea that makes zero sense from a business perspective. Which makes it great for pinside and on par with most industry suggestions here, but terrible in practice.
You are going to need a lot of signatures on your petition to overcome this hard, cold truth.