Using a Subscription to Copy a Top Node in Source Under an Existing Parent in the Target

I'm using a subscription to copy a top node and all of its descendants to a target viewpoint. However, in the target viewpoint, the hierarchy needs to roll up under a different member. In other words, in the target it's not really a top node. For example:

Source

• Parent_XYZ (a "top node" in the source)
  • Child_A
  • Child_B
  • Child_C

Target

• Some_Other_Member
  • Parent_XYZ (not a "top node" in the target)
    • Child_A
    • Child_B
    • Child_C

I have tried using a transform on the Parent property in my node type converter. I've tried checking to see if it's null, isEmpty and have even looked for a specific node name.