Redirect single article permalink to paginated category page

I found a solution that works! Code can be improved, but this is a start.

Put this in single.php:

<?php /* 1. First check to see if single is in the category that is not allowed to be viewable through the single template: */  
if (in_category('in-het-kort') ) {

/* 2. Do a loop to determine how many posts there are in a certain category. */
$args=array(
    'cat'       => 1036,
    'showposts' => -1
);

$count=0;

$my_query = new WP_Query($args);
if( $my_query->have_posts() ) {

    while ($my_query->have_posts()) : $my_query->the_post();

        /*Find out what the offset is for the current post */
        $count++;
        if ( $current_post == get_the_ID() ) {
            $post_offset = $count;
        }

    endwhile;

} 
wp_reset_query();

?>

<?php /* 3. Then construct the URL to redirect to. */ ?>

<?php 
$postsperpage = get_option('posts_per_page');
$cat_page_number_notrounded = $post_offset / $postsperpage;
$cat_page_number = round($cat_page_number_notrounded, 0, PHP_ROUND_HALF_UP);
$redirect_url = get_bloginfo('url').'/categorie/in-het-kort/page/'.$cat_page_number.'#post_'.get_the_ID();
?>

<?php /* 4. Then redirect the user to this URL either via Javascript... */  ?>   
<script>
window.location = "<?php echo $redirect_url; ?>"
</script>

<?php /* 5. ...Or via PHP, depending on your needs. */ ?>
<?php wp_redirect($redirect_url); exit; ?>

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