Pushbutton to 4-Speed - Pushbutton Delete Plate?

1964 Dart GT converting from /6 w/ auto to 273 w/ 3-speed OD.

I heard a nasty rumor there is a pushbutton delete plate. So far I haven't seen one anywhere. I'm a newb and haven't found anything on the Interior forum.

Are they made from unobtanium?
Have people been making their own?
What years did they have this dash?
Are people using plugs of some sort?

Thanks. GR