Yes, of course you can. In my laptop it would be at least a few clicks to do that, and then an extra click to close On-Screen keyboard.
Or I can simply click the Numlock shortcut I have on my Quick Launch Toolbar (highlighted, screenshot might look unfamiliar for I have Taskbar vertically on the left):
BTW, got it working on all laptops I have tried. Don't know why it didn't first work on one.