I remember having a set ammount of money to spend at the arcades while my parents were playing their bowling league, being intelligent on how to spend them was part of the experience. That was at the time of Pacman JR and Spy Hunter.
Later in life, with my own money, it was to not spend in the wrong machines and trying to not spend too much. The 90s and early 2000s games were quite different, and games were no longer 1 coin... lol.
Again, pulling coins from your pockets and putting them in the machine for a continue was part of the experience.
I don't want a full blown coin mecanism, have no real use for that. But I'd be happy if I can manage to have a switch to activate by passing a coin to the coinslot somehow; if there's ANY way to arrange those on-the-cheap doors, I'd be all set.
Short of that, I'll look on eBay I guess.