Why there was a question?
If I have the correct visualization of a curve in the editor, I can create
Constructive Solid Geometry.
On the picture green prism (bezier_spline) and red curve (bezier_spline).
If sphere_sweep, also as the prism, supported bezier_spline, it is possible to
write:
difference{
    object{prism}
    object(sphere_sweep}}

I can't make it.
I can't reel up a spiral on SOR.
I can SOR and sphere_sweep to model as nurbs, but to write down as cubic.
But, if to displace control points of a curve on Z, the geometry will be broken,
but control is absent also correction not to make.

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