Can't insert node field with FlexSlider formatter

Hi could hack the flexslider with this code in one of my custom module. But it is a bit ugly. :(

/**
 * Implements hook_field_attach_view_alter().
 */
function MYMODULE_field_attach_view_alter(&$output, $context) {
  if (
    empty($output)
    || !is_array($output)
  ) {
    return;
  }

  foreach ($output as $field_name => &$render_array) {
    if (
      !is_array($render_array)
      || empty($render_array['#theme'])
      || $render_array['#theme'] != 'flexslider'
      || empty($render_array['#view_mode'])
      || $render_array['#view_mode'] != 'token'
    ) {
      continue;
    }

    $render_array['#post_render'][] = 'MYMODULE_token_post_render_flexslider_field_token';

    $backups = array('#theme', '#states', '#attached');
    $render_array['#flexslider_backups'] = array();

    foreach ($backups as $backup) {
      if (!empty($render_array[$backup])) {
        $render_array['#flexslider_backups'][$backup] = $render_array[$backup];
      }
    }
  }
}

/**
 * Post render flexslider token.
 */
function MYMODULE_token_post_render_flexslider_field_token(&$children, &$elements) {

  if (!empty($elements['#flexslider_backups'])) {
    $elements += $elements['#flexslider_backups'];
  }

  if (isset($elements['#theme'])) {
    $elements['#children'] = theme($elements['#theme'], $elements);
    if (!empty($elements['#children'])) {
      $children = $elements['#children'];
    }
  }

  if (!empty($elements['#states'])) {
    drupal_process_states($elements);
  }

  if (!empty($elements['#attached'])) {
    drupal_process_attached($elements);
  }

  return $children;
}