Agreed, the keypad looks like a fisher price toy. I almost did not buy the Ring System because of how unprofessional its appearance is.
I built a custom touchscreen from an Amazon Fire Tablet using Action Tiles, Fully Kiosk, locked down the tablet, mounted to the wall and Pin coded the entire Ring App from opening. Not the best solution, so I agree a custom app for a tablet or mobile to act as touchscreen with pin coding would be great!
Or a higher quality touchscreen keypad option.