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I wouldn't be surprised if there weren't a more-efficient non-radiating spoke model. However, I bet that would be a bear to program. The spoke/non-spoke models might be effectively orthogonal in terms of energy vs the type of motion, so you might end up with some sort of weird less-efficient hybrid.
What does a Lenze blade look like? I couldn't find it in Google images. Another limitation, is that this is just 2D. I imagine that a more-efficient 3D blade might have a very different profile.