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It occurs to me that suction effect from flow detachment could aid in cooling an air-cooled rear engine.
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This effect is easily achieved by propping open the engine compartment lid of either a Type I or II. The *intake plenum* is exposed directly to base pressure. Then people argue endlessly about the varying results. Examples are shown in the Samba threads I linked. I finished reading those this morning.
The aid you seek would come from exposing the exhaust of the cooling ducts and under-car airflow to base pressure. Which is why the diffuser appeals to me. The designed shape of it would be would be critical. I have no clue.
To bring it back on topic, the rounded tail of the V-S could be brought up to date with Coanda nozzles fed with engine cooling air exhaust.
The original 25hp engine didn't move much air, but it's at 5 psi.