The idea is to create an Automator workflow and assigning a shortcut to it using the following steps:
- Open Automator and create a Service;
- Set the input to no input, and the application to Finder.app;
- Drag and Drop the Run AppleScript workflow element onto the grey space;
- Put the contents of this AppleScript in the textbox;
- Save the workflow with a reasonable name (like New File);
- Go to Settings -> Keyboard -> Shortcuts -> Services and assign a shortcut to it.
- Now, let's show the AppleScript: