I liked @Jimxenus method for the minimote itself. I used his technique in Word to define larger numbers and like @daven bolded the push action. I then added the light gray lines between the buttons for clarity. I just used scotch tape on the sides and over the front for mild protection from dirt and fingerprints.
But I also changed out my device type to @Kyse improved UI for Aeon Minimote so that I get the equivalent labeling capability on my smart phone app. I don’t have to guess what button does what with the Minimote. 
You get to label both the green “PRESS” as well as the blue “HOLD” functions.
