Hello. I currently have the Chrisjen Avasarala Pledge with Add-ons for both the Players Companion and Free Navy Conflict in Print + Pdf. That was all I could afford as of the last day of the campaign. Is it possible to upgrade to the Naomi Nagata Pledge in order to get all four new books in Print + Pdf and just pay the $25 difference as an addition to my over-all charge? Please let me know, as I can afford a little more for the fourth book, but still need to be mindful of over-all cost before shipping is added. Thank you for your attention & cosideration.