Keyboard shortcuts can be stored in any document or template. Chances are that the default location is the normal template.

Keyboard shortcuts that activate macros should be stored in the file that contains the macros. The same is true of QAT modifications.

See Chris Woodman's Keyboard Shortcut Organizer and Modifying the QAT in Microsoft Word. The version of the shortcut organizer from Chris' old page's archive is a zip file needing to be decompressed. Once that is done, it would be a .dot file and your system may not be set to recognize that. Also, it will not work with 64-bit versions of Office AFAIK. That is the only tool I know for copying/moving keyboard shortcuts. Without it, you will have to recreate them.
KeyboardOrganizer2013button.png
To get my version with the ribbon interface, go to the bottom of the link above where it gives the version number or click on the screenshot shown above (on the linked page). AFAIK, the ribbon version also will not work on 64-bit versions of Office, since it is the same code with the different interface. I use this on my computer with Word 2013 and 2016 (32-bit versions).

In Word 2007 and later, both the original and the modified version require that the Trust Center Settings be set to trust access to the vba project. This is not a default setting. You may want to only check it when you want to use this Add-In and otherwise leave it unchecked.

I recommend storing macros and other customizations in a separate Global Template. It makes backing them up and sharing them much easier.

Moving (Sharing) Customizations in Microsoft Word