BTW, Tim, I’m not recommending it as “safe,” but I happen to visit my audi’s web page and noticed a big pop-up ad at the top of her web page that she’s still open for visiting, supposedly taking necessary steps to protect her patients, and “come on over if you need help!”
So perhaps if occlusive molds could help eliminate overwhelming noise and you could just temporarily switch to such molds for a drive, there might be an audi or HCP in your area who is similarly (ill-advisedly?) still open for business - although I guess it’s hard to beat Costco’s price of ~$50 per mold as reported on this forum - and they’re probably not open for business. Maybe power domes are worth a try to see how much they help reduce background noise in a car?
Good Luck! Hope you can invent a reasonable solution - you might help other folks in a similar situation if you could come up with something really workable.