This is probably an inefficient solution, but I just did this the other day using dockur/windows as a VM and passing through the drive. It’s really easy if you have docker experience.

Once the VM has installed Windows to the drive you can just boot from it as normal (whatever the VM does to Windows to make it wanna boot in a VM let’s it boot off the USB)

Here’s a link the docs for this: docker/windows

Let me know if you have any questions :)

I use ActivityWatch for this. Sounds like exactly what you’re looking for