thanks for the reply Julian!
I've tried your technique and no such luck I'm afraid
I put the pen very close to the screen and then pressed the Tablet Pro shortcut button and nothing happened. I tested the other buttons (the Ctrl and Shift shortcuts) and they functioned normally, I was able to hold them while hovering the pen over the screen and the object I was moving around was affected, so the pen is definitely being recognised as a cursor before it's in range.