Is there a short code to add one of the sidebars (right) to a full width page. Or can get the template code to make a page template that will only show one of the sidebars?
There isn’t such a template, you can however however create it yourself, just take a look at how the other templates are made. For example for the template content-sidebar you only need to change get_sidebar();
with get_sidebar( 'right' );