Hello jasonmbrown,
Sorry I'm a bit confuse. You would like to have a numpad (virtual numkey on touchpad) or actual num key?
GL531, which is the same as G531, which has a model that has "numpad".
You may take it into your concern.
Please kindly do not change the hardware since the BIOS and driver design are different between each model.
It might not work as expected.
Thank you.