Has anyone put a cabin air filter (dust/pollen) in a Defender?

Yes, I know, wtf...

However, my brother and I are rebuilding from galvy chassis a 1989 110 for Australia and Africa overland work. (Complete rebuild of everything - currently at rolling chassis stage.)

Whilst my brother smokes so doesn't care, I am feeling that some sort of particle filter from the dust coming into the cabin would be good.

Clearly, there are Discovery options but I wondered if any of you ladies and gentlemen had any experience in fitting a pollen/dust filter to a Defender in any way from either a disco or other vehicle?

We are not fitting air con into the vehicle but taking small portable units to allow aircon in tents if required.

Cheers in advance.

I would have thought there are too many gaps for dust to get in on a tratter.
Door seals, bulkhead vents, nowt is airtight.

You're welcome

...I need a filter in mine to clean the air leaving the cabin!

I’ve cleaned the the A/C ducting out and it was dreadful.....there’s no inlet filtration, gross.