You can try the same things to your secondary like 40watt said -stirring, warming slightly and wait a few days. If it doesn't drop I would chalk it up to experience and enjoy. Repitching yeast at this point to get a couple points isn't worth the risk of contamination. imho
Are you sure the fermentation is stuck, or just slowed down? There should be enough yeast even if the airlock blew off. My batches would take off and then slow down to a crawl until I increased my starter size, it's easier to stop the fermentation by chilling it down then trying to kick start...