Used the app image version ran using Fatdog. In the gui menu I opted for the light version (jwm) but tweaked that to throw out a lot of that content, swapped out jwm for cwm and added in tigervnc-viewer.
First run failed - due to using a folder name containing spaces (/mnt/sda3/Fred mklive).
Second run built, but didn't boot to X, AMD/radeon issues.
Third run after including firmware-nonfree, firmware-ati-graphics ... built and booted to desktop OK (after some minor tweaking to set openbsd-cwm as the window manager), using Porteus style (grub4dos) save on exit to folder boot style.
apt update
apt install sndiod
ran (on the Debian 'client')
sndiod -dddd -a on -f rsnd/1 -L-
and fired up vncviewer, connecting to my Fatdog server, and started chrome
AUDIODEVICE=snd@192.168.1.9/0 /opt/google/chrome/chrome --no-sandbox
and youtube playing maximised with sound forwarded/heard on the debian client OK
Very responsive/usable. Sound is good quality/pure, feels as good as if chrome/sound were all being run locally on the client.

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Around 23Mbs (2.9MB/sec) for the near full screen video and sound play back to the debian (laptop/client) system.
Two-finger touchpad browser scrolling is very smooth/quick. I full screen the 1440x900 server resolution on vnc connect and my laptops 1366x768 screen automatically pans around that when mouse to the edges of the screen.