you're almost there.  

This is just me thinking/coding out loud, untested, but maybe it helps slightly

import maya.OpenMaya as om


def getPointArray(dagNode, components):
        dagNode.extendToShape()
        fn = om.MFnMesh(dagNode)

        pts = om.MPointArray()
        fn.getPoints(pts, om.MSpace.kWorld)

        return pts


def implantPtPosition(dagNode, components, pts):
        dagNode.extendToShape()
        fn = om.MFnMesh(dagNode)

        indices = om.MIntArray()
        fnSingle = om.MFnSingleIndexedComponent(components)
        fnSingle.getElements(indices)

        for i in xrange(indices.length()):
                fnMesh.setPoint(indices[i], pts[i], om.MSpace.kWorld)


sel = om.MSelectionList()

srcDagNode = om.MDagPath()
tgtDagNode = om.MDagPath()
components = om.MObject()

om.MGlobal.getActiveSelectionList(sel)

sel.getDagPath(0, srcDagNode, components)
sel.getDagPath(1, tgtDagNode)


pts = getPointArray(srcDagNode, components)
implantPtPosition(tgtDagNode, components, pts)




 

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