<kbd>Fn</kbd>+<kbd>Ctrl</kbd>+<kbd>F8</kbd> will highligh the Finder menu bar icons on the right, arrows will navigate you to the Keyboard preferences icon.  

[![enter image description here][1]][1]

Depending on how you have your Function keys configured, the <kbd>Fn</kbd> is optional. Of note, <kbd>Fn</kbd>+<kbd>Ctrl</kbd>+<kbd>F2</kbd> will activate the Finder menu bar's Apple  icon on the left hand side.

In macOS Sierra you can also use Siri to help with this. Invoke Siri with whichever keyboard shortcut you choose from System Preferences >> Siri::Keyboard Shortcut, for example <kbd>Option</kbd>+<kbd>Spacebar</kbd>  

[![enter image description here][2]][2]

...then say "Turn on the Keyboard Viewer"  

[![enter image description here][3]][3]

...and voila:  

[![enter image description here][4]][4]

Unfortunately, Siri will not close the Keyboard Viewer, nor will command w


  [1]: https://i.sstatic.net/qgnjl.png
  [2]: https://i.sstatic.net/PeJCX.png
  [3]: https://i.sstatic.net/8QZDA.png
  [4]: https://i.sstatic.net/bJGWX.png