Trench Ball is the variation to Dodgeball that would be the best way to change the game. Instead of knocking someone out by hitting the with the ball the go behind the enemies court in the "trench" and wait for either there team to throw them a ball and go back to there side or if a ball rolls to them they may pick it up and throw it at the enemies back so everyone has to be on there toes and ready for anything. It makes everyone think about the surroundings and keeps everyone actively engaged in the class.
Some safety tips for the game would be that the ball must stay below the waist. In the end I believe that it would be best to stay away from the game of Dodgeball.