>The reason this supposedly works is the laying worker (s) are too big to fly that well so they can not make it back to the hive.
This is simply not true. The only reason that it SOMETIMES works is because of the total confusion that it causes. http://bushfarms.com/beeslayingworkers.htm
A queen cell would be the simplest solution, but open brood is always helpful. Once will improve queen acceptance significantly. Once a week for three weeks will fix the problem completely and they will raise their own queen, or at that point you can introduce a queen.