The Rigid element transfers forces to each node to keep the nodes on the plane, even through the plane can rotate as a whole if RZ is free on the pilot node, or kept vertical if RZ = 0 on the pilot node. The plane I am talking about is the YZ plane that is the cut boundary at the 25% station of the hull. That plane can rotate about the Z axis if RZ is Free, or be kept vertical (parallel to Y axis) if RZ = 0.
If you know the bending moment at the 25% station of the hull, you can apply that as a moment to the remote point as a Moment load about Z. Use the same remote point in the Remote Displacement but leave RZ Free.