You can use just one piece of geo and one shrinkWrap node for multiple
pieces of geometry.
If you select all your curves and the geo and shrinkWrap there is a flag in
the options to use one shrinkWrap node. In the code you just parse in a
list of curve as an argument to the deformer command
This code will work if you have all your curves selected. Also if you
create the sphere using pymel and assign it to a variable you don't need to
use the PyNode class when connecting the worldMesh attribute.
##############################################
import pymel.core as pm
curves = pm.selected()
sphere = pm.polySphere(n='sphere',sx=400, sy=400)[0]
shrinkWrapNode = pm.deformer(curves, type='shrinkWrap')[0]
sphere.worldMesh[0] >> shrinkWrapNode.targetGeom
shrinkWrapNode.projection.set(4) # closest
shrinkWrapNode.closestIfNoIntersection.set(True)
###############################################
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