To fly the Dutch Roll (in model flying) I used to get the plane flying away from myself at 80% power, with almost fully back on the stick, to give a high nose attitude slow flight. Then a quick dab of rudder would make the plane bank 40-60deg to the left, followed by the same to the right, then to the left... etc etc. The only Input I had was to hold the stick almost right back to hold the altitude. Release the back pressure before the model went out of sight... and then RTB.
It is true that the flight path is stable, the plane keeps flying in a straight line.. Just wobbling R+L+R+L....
btw Jock.. What is a Yaw Dampener? Is it an Electronic Gizmo Box of tricks, or something mechanical.