signup page with sidebar

Just wondering how I can get the sidebar to show on the mu signup page. I’m using Twenty Ten and the sign up page displays in a one column with the content pushed to the left.

I opened wp-signup.php and took a look and changed line 63
<div id="content" class="widecolumn"> to
<div id="content" class="narrowcolumn" role="main">

then added
<?php get_sidebar();?>
above
<?php get_footer(); ?>
at the bottom

The sidebar shows, but it’s shoved down below the content. I’m sure this isn’t the proper way to go about doing this as it will be overwritten with an update, but I can’t think of any other way, or find much info on it.