If you are really despite you can always use these cuties: https://noctua.at/en/products/fan/nf-a4x10-flx. Not sure how much it would help but is an idea for spot airfllow. I use the 20mm thick version (https://noctua.at/en/products/fan/nf-a4x20-pwm) on my electric skateboard and the 20mm push a...