Updating dc:coverage with Geolocation address?

Omeka Classic Plugins
2

I’ve been trying to address this issue with a plugin that uses hookBeforeSaveItem. I’ve figured out how to add the address from geolocation into a DC element, but I don’t understand how to delete or replace existing element texts for that element. Here’s what I have so far:

?php

class GeoToCoveragePlugin extends Omeka_Plugin_AbstractPlugin
{
    protected $_hooks = array('before_save_item');

    public function hookBeforeSaveItem($args)
    {
        if (!($post = $args['post'])) {
           return;
        }

        $item = $args['record'];
        // If we don't have the geolocation form on the page, don't do anything!
        if (!isset($post['geolocation'])) {
            return;
        }

        $geolocationPost = $post['geolocation'];

        $db = get_db();
        $elementTable = $db->getTable('Element');
        $coverageElement = $elementTable->findByElementSetNameAndElementName('Dublin Core', 'Subject');

        if (!empty($geolocationPost)
            && $geolocationPost['latitude'] != ''
            && $geolocationPost['longitude'] != ''
            && $geolocationPost['address'] != ''
        ) {
            //This next line doesn't actually delete element texts
            $item->deleteElementTextsByElementId(array($coverageElement->id));
            //This next line DOES add the address from post into the DC field
            $item->addTextForElement($coverageElement, $geolocationPost['address']);
        } else {
            //Still need to complete this
            }
        }
    }
}
?>

Any help would be much appreciated.