As expected Gary has the most business efficent approach. I was waiting for his answer when i read the topic. Same thing with me. do a great job, everyone's happy, leave and never hear from them again. Call and chase them down if you can. I'm at the point where I'm not going thru all that for one $100 gig at a time.
As Gary said, sit down one time and get it all done, "IF" the Ad will commit to that much in the future.
Worth a try and if it doesn't work you have a lifetime supply of cheap pens.