Big Show with OK Feature
Was the OK/Red Letter Game feature one of the most popular? Seems like it, and here's a machine Franz found in Belgium where the operator changed the ballyhole feature (on this game awards first extra ball).
The new Big Show + OK gives you an OK game when you put a ball in BOTH 1 and 12 holes, or just the 16 hole.
Since the game has no R-button, a button was added to the front to collect the OK game. If that wasn't there, the game could reset early before you collected other wins.
While the OK level was likely based on the red or green odds, there's still a lot of circuits that would be needed to step the scores/features to the right place, assuming it's implemented like the standard OK/Red Letter feature.