swap navigation menu through a hook

How do I swap menu through a hook conditionally?
I have to swap depend on cookie so plugins out there can't handle.

I've done with another theme but this don't work with GP.

function my_wp_nav_menu_args($args=''){
 if(!empty($_COOKIE['translator-translator-jquery-to']) && $args['theme_location']=='primary'){ 
   $args['menu']='MAIN2';
  }
  return $args;
}
add_filter('wp_nav_menu_args','my_wp_nav_menu_args');