WooCommerce Products Visibility - Redirect 404 pages for not visible products to custom page

gistfile1.txt

function redirect_404_to_custom_page($query) {
    if ($query->is_single() && $query->is_main_query()) {
        if (class_exists('WCPV_FRONTEND')) {
            $wcpv_frontent = WCPV_FRONTEND::get_instance();
            if ($wcpv_frontent->rules_are_applied()) {
                $post_type = $query->query['post_type'];
                $product_id = $query->query_vars['p'];
                if ($post_type == 'product' && !in_array($product_id, $wcpv_frontent->include_products)) {
                    wp_redirect('http://www.mysite.com/webpage-to-redirect'); // insert the page you want to redirect to here
                    exit;
                }
            }
        }
    }
}

add_action('pre_get_posts', 'redirect_404_to_custom_page');