Plugin Mod. + Back End Functionality.

Hi, We have an online pharmacy site, and currently have an imperfect solution for redirecting users to a consultation form that is required before the purchase their medication. I came across a plugin ([login to view URL]), and feel we could utilise this, to make things cleaner, and easier. Some modifications would be needed however. We have 3 categories of product Cat 1 - Add directly to basket Cat 2 - Pop Up Form >>> complete >>> then add to basket Cat 3 - Redirect to Assessment Page >>> Complete >>> Then select product Ideally, I'd like to condense this to two categories Cat 1 - Add directly to basket Cat 2 / 3 - Complete Assessment >>> Add To Basket On Assessment Completion Gravity form data is then passed to the basket by way of query string, and this passed into the order information in the back end. So I need these steps to be recreated. . . An alternative solution, is add the item to basket immediately, and somehow collect the data with a gravity form that appears in checkout, conditional to the product(s) added. We would then also need admin modifications to make sure all data is easily viewable in the backend - in addition, orders should have a 4 different statuses, which are changed by an admin user depending on whether an order is approved for dispatch or not. I already have some code for this, but recoding may be easier. User histories should also be incorporated (not sure if there are plugins to help here?)