i see that this post is kind of old, and I hope you got your issue resolved but if you want to change the order statues in the admin, you can use our new Order Status Override Extension.
This extension lets Magento Admins edit the status of an order without having to invoice/ship the order in Magento or apply any custom order status to the order without having to go through the action Magento usually requires.
Check it out: Magento Order Status Override
Hope it helps!
Redstage Extension Store