Would it be possible to add an "End Task" shortcut into VR?

In that case, you might want to set Task Manager to Always-on-top.

Alternatives to Task Manager

Method 1
Alt-F4

 
Method 2
Save a new text file to your Desktop and enter the following:

taskkill /f /fi "status eq not responding"

Save the file and change the extension from .txt to .bat.
Double-click the new batch file and it will close any apps that are unresponsive according to Windows.

 
Method 3
Create a keyboard shortcut for the command from Method 2, as described here:

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