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OK. Trying to generate the tags, with encoding in a Drupal theme preprocess function. In this, we pass the final tag value as a Twig theme variable.

use Drupal\views\Views;
use Drupal\Core\Url;
use Drupal\node\Entity\Node;

/**
 * @param $variables
 */
function starkprint_preprocess_node(&$variables){

    $landscape_fragment = new Phpdocx\Elements\WordFragment($docx);
    $landscape_fragment->addWordML('<w:p xmlns:w="http://schemas.openxmlformats.org/wordprocessingml/2006/main"><w:pPr><w:sectPr><w:type w:val="nextPage"/><w:pgSz w:code="9" w:h="11906" w:orient="landscape" w:w="16838"/><w:pgMar w:bottom="850" w:footer="708" w:gutter="0" w:header="708" w:left="1077" w:right="1077" w:top="850"/><w:cols w:num="1" w:space="708"/><w:docGrid w:linePitch="360"/></w:sectPr></w:pPr></w:p>');
        
     $landscape = '<phpdocx_wordfragment data-content="'.base64_encode(serialize($landscape_fragment)).'" />';
     $variables['landscape'] = $landscape;

     $portrait_fragment = new Phpdocx\Elements\WordFragment($docx);
     $portrait_fragment->addWordML('<w:p xmlns:w="http://schemas.openxmlformats.org/wordprocessingml/2006/main"><w:pPr><w:sectPr><w:pgSz w:code="9" w:h="16838" w:orient="portrait" w:w="11906"/><w:pgMar w:bottom="850" w:footer="708" w:gutter="0" w:header="708" w:left="1077" w:right="1077" w:top="850"/><w:cols w:num="1" w:space="708"/><w:docGrid w:linePitch="360"/></w:sectPr></w:pPr></w:p>');
        
     $portrait = '<phpdocx_wordfragment data-content="'.base64_encode(serialize($portrait_fragment)).'" />';
     $variables['portrait'] = $portrait;
}

In the Twig template, we put:

{{ portrait }} {# this should give us the phpdocx tag for portrait layout #}

...Text to be portrait orientation...

{{ landscape }} {# this should give us the phpdocx tag for landscape layout #}

...Text to be landscape orientation...

But... this isn't working either. Do I need a 'use' statement, in order to call the 'new Phpdocx\...'?

Is there something else I should be trying?

Thanks