I have simillar problem - but for listing_table
Sorry - but it seems your advice is not right.
For the prices is this code in listing_table.php:
if($this->params->get('show_price','-1')=='-1'){
$config =& hikashop_config();
$this->params->set('show_price',$config->get('show_price'));
}
if($this->params->get('show_price')){ ?>
<td class="hikashop_product_price_row">
<?php
$this->setLayout('listing_price');
echo $this->loadTemplate();
?>
And in this code it is not possible to move the price excluding VAT to a new line.
hmm ?