Simplified interface for touchscreen

We are implementing touchscreens for our fulfillment and trying to simplify the packing process. I am creating a floating window with a few buttons using AutoHotkey to provide larger targets for clicks. As part of that there are macros that will do things such as automatically print the packing slips and close the PDF window. I am able to send input to the browser and make it work using simulated mouse activity. For the most part all that needs to happen is clicking Save & Print or Save & Bill with a few other options.

Is there a resource available with the commands I need to send to directly activate these buttons? I worry that using mouse clicks or tabs to get the right button will fail if the interface changes or even user preferences change.