Key binding doesn't consider having num lock on or off

I intend to map my open inventory key binding to the END key. When num lock is off, the END key is numeric pad 1, but it only maps to num 1 no matter if num lock is on or off.

The reason for doing this is that I use a laptop and some times I dock it in a station with a keyboard and some times I play without external key board.

I am also left handed and have to remap all the keys different (a lefty preset would be amazing)