Yeah I know, I have used the importer a lot, I know how annoying it can be when working on several objects. I'd copy the exact folder structure you have been using into the user directory, then once you have finished copy to the preferred location in purchased. I must admit to being very fast at getting from the user folder to my custom folder now, just hit the button to move back through the folder, then press the c key then open the folder... Still can be a pain as I normally have to find other folders from there. It would be nice to have it default at the last opened directory or to be able to set it of course.
Also, perhaps a shortcut link to your directory would be faster? Just make one from the user folder that takes you straight to the purchased one or even to your pack's own unique folder.
SPECS: Ryzen 1700 CPU. Nvidia 970GTX. 16 Gig Memory. Win 10.