See I was going through the link and
I found the following quote
Don't provide an alternate behavior for the Win+Z keypress combination in your app. Develop an app bar or similar context menu, and display it when the user presses the Windows key in conjunction with the Z key. Register for the KeyDown and AcceleratorKeyActivated events to determine when these two keys have been pressed.
So i really think if you can work this the other way round like windows + z do some thing else. I mean override the functionality then it might work
Here's the link
This is just a suggestion see if you can work your way round else I dont think there's an option.