Alternate 737MAX design kludge
Correct me if I'm wrong, but the pitch up issue that MCAS addresses happens because the larger diameter engines are positioned further forward of the wing (and higher up). This means the thrust is acting from a different point than earlier 737 models. High thrust causes a turning moment about the plane's centre-of-mass, requiring elevators to compensate.
Why did they not put a small duct on the back of the engines, so the thrust acts from the same point as earlier 737 models? Ducts must be practical since they were used in the Lockheed Tristar.
The thrust reverser could be moved to the end of the duct, or be directed through a flap in the duct.