I managed to move a tooth back on mine while it was out of the car, however the teeth on mine are worn slightly. Required quite a couple of precision screwdrivers and a lot of swearing iirc.
You may have a chance of accessing the cogs if you remove the passenger lower dash and centre console and crawl into the footwell. I wouldn't count on it though!
On the plus side, moving one tooth has lined up the control perfectly.