Allowing Blog/Site to Clone Individual Post From Main Blog/Site

I started thinking through my description … here are some functions that I thought of, and an order I started putting them in.

Anyone have suggestions on a streamlined way to turn it into something useful>

/***********************************************/
/* To switch to another blog */
/***********************************************/

<?php
    global $switched;
    switch_to_blog($main_cat_id);
    echo 'You switched from blog ' . $switched . ' to ' . $main_cat_id ;
?> 

/***********************************************/
/* To get the category ID by Name */
/***********************************************/

<?php $main_cat_id = get_cat_ID( $cat_name ) ?> 

/***********************************************/
/* To get a list of post from a category */
/* Place this code before the restore_current_blog() above */
/***********************************************/

//
// Edit the action below so that the selected item is saved to an array
//

<form action="<? bloginfo('url'); ?>" method="get">
 <select name="page_id" id="page_id">
<?php
 global $post;
 $args = array( 'numberposts' => -1, 'category' => $main_cat_id,);
 $posts = get_posts($args);
 foreach( $posts as $post ) : setup_postdata($post); ?>
                <option value="<? echo $post->ID; ?>"><?php the_title(); ?></option>
<?php endforeach; ?>
 </select>
 <input type="submit" name="submit" value="select" />
 </form>

/***********************************************/
/* To switch back to the original blog */
/***********************************************/

<?php
    restore_current_blog();
    echo 'You switched back to ' . $switched ;
?>

/***********************************************/
/* Now create some code to save the post object as Special Offer #1, 2, 3 or 4  */
/***********************************************/

<?php
// Update post
  $my_post = array();
  $my_post['ID'] = 37;

// Update the post into the database
  wp_update_post( $my_post );
?>

/***********************************************/
/* Memo from a Google search */
/***********************************************/

The function that calls the pre_post_update hook appears on line 1525 of wp-includes/posts.php for me:

do_action( 'pre_post_update', $post_ID );

As you can see, it passes the ID of the post being updated when it is executed. To get the post from there, you would just call get_post(), e.g.:

function do_something_with_a_post($id) {
     $post = get_post($id);
     // now do something with it
}
add_action('pre_post_update', 'do_something_with_a_post');

The $post variable above should reference an object with all of the various attributes about a post you are looking for, hopefully.