Oh, come on Boise Nick. Think.

All forces and moments acting on any point in the univers can be translated to forces and moments acting on any other point in the universe, using relatively simple algebra. And if a set of forces and moments act at the resolution point, then they are simply summed "as is." There is no requirement in NEMA SM-23 to create nonexistent moments from forces acting on a line passing through the resolution point.

I agree with Dave Diehl - if the centerline of the exhaust and the turbine rotor intersect, use that point.

If they do not intersect, I have always simply resolved the forces and moments to the point on the centerline of the exhaust nozzle nearest the turbine rotor centerline.