If you are a land surveyor, then in no circumstances should you scale your drawing, particularly NOT with the "ScaleAboutCentre" lisp. Your coordinate system will be lost, and for surveyors, that is a capital crime.
Although your drawing is too large to be on an A0 at 1 to 200, how much is it too large? In the past, I have managed to put a drawing onto an A0 at 1 to 250 scale, and that entails no scaling.