Kolokial on "Automating POST and import to WordPress Importer"

I'd like to try and setup a an automated .xml import, using the WordPress Importer.

Basically, I want to submit an .xml file at the click of a button from either the wp-content/themes/theme-folder/ or an external source to wp-admin/admin.php?import=wordpress and run it through the WordPress Importer to import the data.

This has proven difficult so far. Is it even possible to POST a file from the server to the server again?

I've searched through the wp-admin folder and files relevant to imports, and the wordpress-importer.php plugin to see if I can bypass the upload part of the process, and maybe use a class to initiate an import, but everything i've read and seen suggests the import is dependent on the upload.

Here's what I've been trying though.

Reading the .xml file into the parse class. The .xml file outputs if I put it into $output, and the if($importing->parse($xml)) returns true, but no information appears in WordPress or the database.

require_once ABSPATH.'wp-content/plugins/wordpress-importer/parsers.php';
function get_sample_data(){
 $output = '';
 $importing = new WXR_Parser();
 if(isset($_GET['get_sample_data'])){
  if($_GET['get_sample_data']){
   $xml = get_data('xml');
   $output .= $xml;
   if($importing->parse($xml)){
    $output .= "Parsing passed";
   };
  }
 return $output;
 }
}

http://wordpress.org/extend/plugins/wordpress-importer/

[No bumping. If it's that urgent, consider hiring someone.]