How to wrap / manipulate element outputs on a form's checkboxes html?
You could use your get_office_options function and add some html

For example:

$alphas = range('A', 'Z');
    foreach($w_question-&gt;get('field_option_radio') as $key =&gt; $option){
        $options[$option_id] = '&lt;i&gt;&lt;/i&gt;'.$option_text;
    }

    return $options;