For what it's worth, the HVAC fan motor is easily accessible, and may offer a place to insert filter media.
On the right side of the dash, just above where your right toe would be, is the fan. Remove 3 8mm hex-head screws, and it drops down. There is a two-wire plug that is easily unplugged. You can then look up into the housing and see that it MAY be possible to add some type of filter media material for filtration. I am not sure about the direction of air flow, so that will factor in your plan.
However, the factory only pays 2/10 of an hour for labor to change the fan, so you know it is easy and fast. I already had to replace my fan motor....it sounded like crickets chirping and once it just didn't start at all....just got hot. I couldn't find anything in the housing that would prevent the fan from turning. No way to oil the motor, either. Dealership charged me $55 for a new fan/motor ***'y, and I installed it myself. Piece of cake, even for a 55-year old fat guy. There is limited room for a driver, but my old Makita cordless drill motor worked great and fit the confines of the interior.
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