For this I would either use eventGhost, or the "hook" plugin for VC.
With the hook plugin you can either use single keys or key combinations. With single keys you get keydown and keyup events so this would be good if you have a single key on your keyboard that you never use. With keyboard combos like Alt-F2, you will get an event for the combo but not for when the combo is release. So if you used a key combo you would either need to use a push to toggle approach, or you could use the combo to turn VC on and then use the keyup of the last key in the combo to turn vc off again
On Event>> Hook.LControlKey+LShiftKey+Oemtilde
Off Event>> Hook.Oemtilde.Up