Drupal Hook_Menu redirect to a themable tpl page

<?php
function mymodule_menu() {
  $items = array();
 
  $items['my-special-page'] = array(
    'title' => 'This is my custom page',
    'page callback' => 'my_special_page',
    'access arguments' => array('access content'),
    'type' => MENU_CALLBACK,
  );
 
  return $items;
}
 
function my_special_page() {
  return theme('my_special_page');
}
 
function mymodule_theme($existing, $type, $theme, $path) {
  return array(
    'my_special_page' => array(
      'arguments' => array('options' => NULL),
      'template'  => 'page-my-special-page',
    ),
  );
}
 
// 
//replace the whole page
 
function mymodule_theme_registry_alter(&$theme_registry) {
  $theme_hook = 'page'; // my hook name
  // Get the path to this module
  $modulepath = drupal_get_path('module', 'mymodule');
  // Add the module path on top in the array of paths
  array_unshift($theme_registry[$theme_hook]['theme paths'], $modulepath);
}
?>