You could use E.showAlert, or E.showPrompt if you want to customize your own buttons. I'm not sure what you mean by corrupting the display for the clock - once the user hits okay you can use something like load() to return the user to the watch face.
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
You could use E.showAlert, or E.showPrompt if you want to customize your own buttons. I'm not sure what you mean by corrupting the display for the clock - once the user hits okay you can use something like load() to return the user to the watch face.