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Thanks GreyHead. Nice work!
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If someone else need the uniq_id to be accessible in $form->data[], try the action from GreyHead.
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Or try the following, which was my attempt:
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Insert custom code section before your db save action.

<?php
/* ********** $form->data['uniq_id'] ********** */
$db = JFactory::getDbo();
$query = $db->getQuery(true);
$query->select('a.uniq_id');
$query->from('#__tablename AS a');
$db->setQuery($query);
$uniq_ids = $db->loadColumn();

function gkCreateUniqId(){
    $chars = 'abcdefghijklmnopqrstuvwxyz0123456789';
    $count = mb_strlen($chars);
    $length = 40;
    for ($i = 0, $result = ''; $i < $length; $i++) {
        $index = rand(0, $count - 1);
        $result .= mb_substr($chars, $index, 1);
    }
    return $result;
}

do{
    $form->data['uniq_id'] = gkCreateUniqId();
} while(in_array($form->data['uniq_id'], $uniq_ids));
?>

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adjust tablename and variable $length (and $chars) to your needs.
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Kind Regards
Matthias