> In terms of making a game with them, I think a design where the pins are on the face of the card may be useful. I want to be able to 'draw' a card without knowing what is on it.

That would work. But you can also make that work with current hardware (I think): you just need a delay between pressing the button and the screen changing? So that the player can press the button, pick up the card, and five seconds later, it's revealed.