I just finished modifying the MQ-2 keypad. I cut out one column of buttons and the left raised side part, filed them both down and glued them together. Then I cut out a new notch at the top of the left side.
I also put 2 short pieces of green wire behind it showing through the notches.
Looks great! The real depressable buttons give it that authentic touch.
The only downside is that the numbers and lettering on the MQ-2 are not raised like the MQ-1 so if I painted over it they would be hidden. I'll just leave it the original chrome color then and paint the buttons only.
Are there any good reference photos of the keypad on ESB? Looks like there are yellow and blue buttons but the photos I have are too small to make out exactly how to paint them.