Have you tried a charcoal-activated cabin filter?
I got this back in April when it was on sale for 15 b/c i have free prime shipping: https://www.amazon.com/dp/B00U...f=cm_sw_r_cp_apa_AJ83zbY0G3Z9M
Here's what DAP has: https://shopdap.com//make-mode...-present/air-conditioning.html
I replaced mine back at 5k miles b/c the stock non-charcoal filter that came in my car smelled terrible starting at about 2k miles. I've driven about 5k with the filter from Amazon now, and I don't have any bad smells coming out of the AC vents.
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I just picked the cheapest filter on amazon at the time, figuring that it’s hard to mess up a simple filter. I’ll definitely add the Mann charcoal filter to my wish list, but I still need to take care of the source of the odor.