It’s a good idea to me but take some gloves when ordering. Don’t like the idea of touching a machine before handling my food.
“take some gloves when ordering. “
Ballpoint pen, or the eraser end of a pencil.
I use those little packaged alcohol swabs at ATMs and any public keypad. Simple, cheap, fast.
Maybe a smart phone app with Bluetooth interface. Order and pay with your own device.