Uh... Can't you just add the XML to the ISO and then add the ISO to Ventoy?

[leeuniverse]

So, Ventoy works by just adding any (most) boot ready ISO to the Ventoy Partition for ISO's
So, can't you just add the XML to the Windows ISO using whatever your ISO tool is, and then just add the ISO to Ventoy?

I mean, if the XML automatically is read it should work with a boot ready ISO too right?

UPDATE:
Answered my own question.... Just saw this video of yours "How to Use Unattend.xml Files During Windows Installation (UnattendedWinstall Tutorial)"
And you DO show just adding the ISO to Ventoy, no complicated creating Template and ISO folders etc.

[amordesoul]

The easiest solution is to let the windows media creation app create the usb then copy the .xml file to the root of the USB after the app finishes.