AIR Android app - prevent app from being exited

I am developing a simple Air app for an android tablet (Kitkat) that will be used in a visitor centre in a 'kiosk' mode. I would like to completely prevent users from exiting the app by using the back, home or menu buttons. While I know that the back and menu buttons can be intercepted in Air, the Home button cannot. Does anyone know of a way (perhaps another app / background service, native extension), that will prevent my app from being exited? I've looked at the screen pinning option on Android Lollipop, but I don't think it's a viable and elegant solution.