If the goal is to raise pressure on the leeward side in a crosswind, Maybe you can achieve your goal with a roof-top strake.
https://www.mrn.com/wp-content/uploa...-Las-Vegas.jpg
These are designed to kill lift when driving sideways, but they should have the same effect as a Gurney flap/wickerbill at the rear rolling vortexes down the lee side.
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