Hey now. Let's not get out of hand here. Look at the dashboard of any late 60's thru to the 80's Ford product and look how they solved automatic transmissions that would slip out of Park into Reverse. A sticker.
I had a '69 Fairlane 500 that I could start while I was chugging backwards.
I remember, a freind of mine had a 65 Mustang that could start in reverse. It seemed the auto shift linkage on some Fords were a bit flimsy.
The Dodge had a push button automatic with no Park position. It had an interlock that prior to failure would keep it from starting in anything but neutral.
After failure of that interlock, it would start in any gear it had been left in which made for some "fast get-aways" for a teenager.