Hi,
When I try to open your link, I have got a 500 error page.
You can override the pagination system yes but in your case I think it will be easier to set a maximum limitation.
You can edit the file "components/com_hikashop/views/product/view.html.php" and add some code in the "listing()" function before
$database->setQuery($select.$query,(int)$pageInfo->limit->start,(int)$pageInfo->limit->value);
$rows = $database->loadObjectList();
if(!empty($rows)){
$ids = array();
$productClass = hikashop_get('class.product');
Like:
// begin of lines to add
if((int)$pageInfo->limit->value > 100)
$pageInfo->limit->value = 100;
// end of lines to add
$database->setQuery($select.$query,(int)$pageInfo->limit->start,(int)$pageInfo->limit->value);
At this moment, the listing won't display more than 100 elements.
Note that, it is a modification of a core file so, by updating HikaShop, you will loose your modification.
Regards,