What does HackerNews think of freebsd-wifibox?
wifibox: Use Linux to drive your wireless card on FreeBSD
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There is also wifi box if you want to use a slightly cursed solution that seems to work well enough.
You can use WifiBox[1], being a user of FreeBSD myself (Laptop, Workstation and many servers) it would be nice to have "native" ac/ax.
I hardly can take this as valid answer until https://github.com/pgj/freebsd-wifibox exists and in active use by FreeBSD users.
Thats what wifibox does on FreeBSD (though I believe the reason is more for drivers than for isolation): https://github.com/pgj/freebsd-wifibox
Just run your wifi driver in a Linux vm. https://github.com/pgj/freebsd-wifibox