When I got my first Mustang (90' GT), I got it at a local auction and it didn't have the door/hatch key. It did have the ignition key though. I took it to a local locksmith's shop and the guy took a blank key, stuck it in, pulled it out and filed it a little with a file, stuck it back in, pulled back out and filed a little more, over and over till' it went all the way in and locked/unlocked the door. I'm tellin' you these guys are amazing! The whole thing took maybe 10 minutes. Then I had him make a couple of copies and the total was $40.
If they can do it with the doors, I don't see why they couldn't do it with the ignition.
Just my experience... good luck with it!