Continuing the discussion from What happens with disk encryption when you change OS?:
I’ve never had experience with this. But I’ve done it from a window computer. It should be quite easy with their media creation tool.
But in general if this is possible under linux, it should be possible to do under qubes. The only difference is that you have to attach the USB to the qube where you’re downloading windows.
If it’s not possible to do under linux and you have no windows computer to use just to create the windows installer then the only other option I see is to install windows under Qubes use that to create the windows USB. But that’s quite an adventure.