I dryhop in the keg all the time, but I don't fish them out. I just leave the bag (or the "teaball" type of container) in there until the keg is done. I do this at fridge temps, and not room temperature. I usually finish a keg in 3 weeks, and I have had great results with doing that. Just something to consider!
Broken Leg Brewery
Giving beer a leg to stand on since 2006