Thanks for starting this conversation!
I didn't know audio was not supported with Hyper V!
If this really is not possible this is a huge problem.
Another thing that is a problem is connection to USB devices from Hyper V
I wonder how the Windows license works with Hyper V...
I've used Virtual Box for many things over the years
Those are not a problem for VBOX.
It has a CLI for the manager if the GUI does not address your needs.
Some day I'd like to use VMWare
However, VBOX is free!
I tried to take a course on Coursera that used some sort of VM in the cloud
I could tell it was a Windows VM and I got NVDA installed
I couldn't figure out how to make the audio work
I contacted support and never got a resolution...
Maybe that was based on Hyper V...
Russ