Running Windows on pi400 notes
HDMI sound not working, needs a USB Soundcard. 99p USB Soundcard. if you want a cheap usb one prob just ebay usb soundcard. But sound is not a massive issue for this anyway unless you want to be watching videos.
Problem is that the pi400 has no audio jack which is annoying.
That would probably work, but not sure if windows would have the drivers, i guess for $6 its not much of a risk. ebay search usb soundcard.
Windows 10 On The Raspberry Pi400 Is Here And Performance Is Pretty Good!
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How to install windows on pi400