Hello
Trying to route Kali over a Whonix Gateway but it’s not passing traffic. IP address settings are manually set from within Kali and they are correct but packets will not route. Kali is able to pass traffic over the default firewall VM but not the sys-whonix gateway VM.
This video helped me to get to get a working TOR’ified version of Kali through Virtualbox. I know it doesn’t quite answer the question since this is involving Qubes, but this may indeed be a good starting point for you: How To Fully Anonymize Kali With Whonix - YouTube
Cheers.