After testing on real hardware I noticed that the absence of a xhci driver makes the USB 3.0 slots of this HP Pavilion g6 not safe to use, as it doesn't recognise flash drives that were connected while the system is running, and worse, bluescreens when they get disconnected.
You may notice that my Gitea instance now requires everyone to login to view users and repositories. I had to turn this on because of what appears to be web scrapers that send Gitea's RAM usage to ~60 GB and made the Windows server unusable to others. It will unfortunately stay that way for the forseeable future... :(
I finally took the time today to try running ReactOS on my Xbox Original. Apparently it gets stuck after loading mup.sys...