Upgrade/Modify Subscription from Backend

I have Pro Sites working so that a customer can sign up and get a two day trial of full access. By default, there are links to "Your Account" where the customer can go to upgrade their subscription so they are not limited in functionality. The link to Your Account takes them to the Checkout page. The account can be upgraded their, but I do not like that the customer is taken away from their trial site. Is there a way to have the upgrade/select plan form appear on the backend of the users site?