Creating Multiple Transform Handles for a ModelNode in Slicer 5.7

Development
1

Hello,

Is it possible to create two Transform handles for one model?
I have tried to make it work with the video using the code below, but only one handle works while the other does not function properly.

Am I missing something? Any advice would be greatly appreciated.

scanNode = slicer.util.getNode("scan")
lowerNode = slicer.mrmlScene.AddNewNodeByClass('vtkMRMLTransformNode', 'lower')
upperNode = slicer.mrmlScene.AddNewNodeByClass('vtkMRMLTransformNode', 'upper')

def applyUpper(*_unused):
    scanNode.SetAndObserveTransformNodeID(None)
    
    lowerNode.SetAndObserveTransformNodeID(upperNode.GetID())
    scanNode.SetAndObserveTransformNodeID(lowerNode.GetID())

def applyLower(*_unused):
    scanNode.SetAndObserveTransformNodeID(None)
    
    upperNode.SetAndObserveTransformNodeID(lowerNode.GetID())
    scanNode.SetAndObserveTransformNodeID(upperNode.GetID())

lowerNode.CreateDefaultDisplayNodes()
lowerNode.SetCenterOfTransformation(0,0,-12)
lowerNode.GetDisplayNode().SetEditorVisibility(True)
lowerNode.AddObserver(slicer.vtkMRMLTransformNode.TransformModifiedEvent, applyLower)

upperNode.CreateDefaultDisplayNodes()
upperNode.SetCenterOfTransformation(0,0,2)
upperNode.GetDisplayNode().SetEditorVisibility(True)
upperNode.AddObserver(slicer.vtkMRMLTransformNode.TransformModifiedEvent, applyUpper)

P.S. The Transform handle added in Slicer 5.7 is fantastic.