reading the forum I find the solution added by jmcphail in Suggestion: Be able to add metaboxes field to a specific page to add the metabox to specific page template before was implemented by default on piklist, the I make a variation to implemente the possibility to exclude the metabox for a list of pages templates

Only need to overwrite the function register_meta_boxes_callback on class-piklist-cpt.php

public static function register_meta_boxes_callback($arguments)
  {
    global $post, $pagenow;

    extract($arguments);

    $current_user = wp_get_current_user();

    $data = get_file_data($path . '/parts/' . $folder . '/' . $part, apply_filters('piklist_get_file_data', array(
              'name' => 'Title'
              ,'context' => 'Context'
              ,'description' => 'Description'
              ,'capability' => 'Capability'
              ,'role' => 'Role'
              ,'priority' => 'Priority'
              ,'order' => 'Order'
              ,'type' => 'Post Type'
              ,'lock' => 'Lock'
              ,'collapse' => 'Collapse'
              ,'status' => 'Status'
              ,'new' => 'New'
              ,'id' => 'ID'
              ,'div' => 'DIV'
              ,'template' => 'Template'
              ,'nointemplate' => 'No Template' // ADDED - get the list of templates where not be included
              ,'box' => 'Meta Box'
            ), 'meta-boxes'));

    $data = apply_filters('piklist_add_part', $data, 'meta-boxes');

    $types = empty($data['type']) ? get_post_types() : explode(',', $data['type']);
    
    foreach ($types as $type)
    {
      $type = trim($type);

      $statuses = !empty($data['status']) ? explode(',', $data['status']) : false;
      $ids = !empty($data['id']) ? explode(',', $data['id']) : false;
      $name = !empty($data['name']) ? $data['name'] : 'piklist_meta_' . piklist::slug($part);
      $notemplates = !empty($data['nointemplate']) ? explode(', ', $data['nointemplate']) : false; // ADDED - Convert to Array
      
      if (post_type_exists($type)
        && (!$data['capability'] || ($data['capability'] && current_user_can(strtolower($data['capability']))))
        && (!$data['role'] || ($data['role'] && piklist_user::current_user_role($data['role'])))
        && (!$data['status'] || ($data['status'] && in_array($post->post_status, $statuses)))
        && (!$data['new'] || ($data['new'] && $pagenow != 'post-new.php'))
        && (!$data['id'] || ($data['id'] && in_array($post->ID, $ids)))
        && (!$data['template'] || ($data['template'] && $data['template'] == pathinfo(get_page_template_slug($post->ID), PATHINFO_FILENAME)))
        && (!$data['nointemplate'] || ($data['nointemplate'] && !in_array(pathinfo(get_page_template_slug($post->ID), PATHINFO_FILENAME), $notemplates))) // ADDED - compare to exclude id the templates are in the array
      )
      {
        $id = !empty($data['div']) ? $data['div'] : 'piklist_meta_' . piklist::slug($part);
        $textdomain = isset(piklist_add_on::$available_add_ons[$add_on]) && isset(piklist_add_on::$available_add_ons[$add_on]['TextDomain']) ? piklist_add_on::$available_add_ons[$add_on]['TextDomain'] : null;
         
        add_meta_box(
          $id
          ,!empty($textdomain) ? __($name, $textdomain) : $name
          ,array('piklist_cpt', 'meta_box')
          ,$type
          ,!empty($data['context']) ? $data['context'] : 'normal'
          ,!empty($data['priority']) ? $data['priority'] : 'low'
          ,array(
            'part' => $part
            ,'add_on' => $add_on
            ,'order' => $data['order'] ? $data['order'] : null
            ,'config' => $data
          )
        );

        if (isset($data['box']) && strtolower($data['box']) == 'false')
        {
          add_filter("postbox_classes_{$type}_{$id}", array('piklist_cpt', 'lock_meta_boxes'));
          add_filter("postbox_classes_{$type}_{$id}", array('piklist_cpt', 'no_meta_boxes'));

          if ($name == 'piklist_meta_' . piklist::slug($part))
          {
            add_filter("postbox_classes_{$type}_{$id}", array('piklist_cpt', 'no_title_meta_boxes'));
          }
        }
        else
        {
          if (isset($data['lock']) && strtolower($data['lock']) == 'true')
          {
            add_filter("postbox_classes_{$type}_{$id}", array('piklist_cpt', 'lock_meta_boxes'));
          }
          if (isset($data['collapse']) && strtolower($data['collapse']) == 'true')
          {
            add_filter("postbox_classes_{$type}_{$id}", array('piklist_cpt', 'collapse_meta_boxes'));
          }
        }
        add_filter("postbox_classes_{$type}_{$id}", array('piklist_cpt', 'default_classes'));
      }
    }
  }

How to Use

Build your piklist meta-boxes field file with the following example header declaration:

/*
Title: Normal Page Metabox
Post Type: page
No Template: template-slug-1, template-slug-2
*/

In your theme only need to create your templates where not need the use the metabox and add the slug name without the .php, as you see can add more than one template page using ‘, ‘ between them.

In the code I commented the lines added, Hope this solution can help!

@steve – I know about the updates, sorry but I not explained myself well, should have specified the solution as a suggestions.

Thanks for the tutorial, is a simple and well explained solution.