Thanks.
If the sketch includes the window area and door cut-lines that will disallow things that couldn't work.
The wake is stagnant, low-pressure air. Look at the engine cooling on the Edison2. It is a vertical slot at the maximum camber (widest point of the body). The air is moving fastest there and you can intake or exhaust most efficiently there. For cabin ventilation the window height is prolly adequate.
Edison2 - Very Light Blog - Edison2, Local Motors & Siemens: The VLC Design Challenge
My Superbeetle's flow through ventilation exhausts in the C-pillar. Opening to the wake could allow exhaust gases (if not electric) to intrude into the cabin.