Solved
In case anyone else wants to do this. It was simple once I took a step back.
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Export the character to Maya using Bridge
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Skin the strap to the same joints used in the Head mesh
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Exported the strap out as a FBX
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Imported into Unreal using the Face_Archtype_skeleton (same skeleton used for the head meshes)
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Put this skeletal mesh asset into your Metahuman blueprint and place it under the existing Face skeleton mesh.
