This may not be the answer in your case, but worth mentioning for anyone in similar situation. You can change “home” in the network admin’s edit site page.
Direct link – if you know the blog id number add that to the end of: yoursite.com/wp-admin/network/site-info.php?id=
Or go to: http://yoursite.com/wp-admin/network/sites.php and find and edit the site from there.