I wonder if the spring SOP would help you with that more then the spring CHOP. Add some external forces and keep some points at their base and this might work.
For blending between Animations we do have the Clip and Clipblender CHOPs in the TouchDesigner Pro license which can be used for that.
Otherwise also the Blend CHOP could be helpful.
Very interesting, thanks! Is there a way to specify which points are affected by the external forces? I see a parameter for fixing the point groups, which initially I thought would work the other way around, but by fixing the points they will then meet at origin…