Hi Tom,

Did you have tested the ReconstructCurve script ?

Two ways to use it, but I think you could use it by launch it, choose your line and the PolyLine method.
The result is a polyline with your choosen number of parts.

If you select your line and next launch ReconstructCurve, you will have a soft curve with your choosen number of parts.

To find This script, you can search in Ressources of the site.