Use the micro servo mount kit and Shoe Goo if necessary to adhere the servo to the plate. The splines on the servo will need to suit the servo saver of course otherwise you'll be SOL.
Why dont you just opt for a micro servo like the Hs 81-85 or the Futaba s3101-s3102mg......they might last longer in a crash and have more then enough torque to hold a turn.