@Mabblies is looking at it. I've seen a thread on Lucasforums with the solution, but I don't know how to do it. The SIS item file is in the 103PER module file (where you find it in Peragus), but not in the file that holds the inventory; so it isn't accessible in KSE, though it shows up in the list once a save game acquires it.

So we need to pull the item file from the module file and throw it into the override folder, and you can get it by console command or KSE.