I tried disabling (uninstalling the driver to be exact since this is the only option) the integrated keyboard, but it's not disabled until I reboot, and since rebooting reinstalls the driver, I can't test this. I won't try doing it by group policy, otherwise she won't be able to log in after rebooting. And since she has no other physical keyboard to revert to normal, it's too dangerous to try that.

Unfortunately, it's at my mother's home and I help her remotely. She does not have a spare usb keyboard to connect.

AMD 5600X + RTX 3080

Thank you. You are right, I did it and was able to switch back without any issue.

WARNING: running this command can be really dangerous and I just got the consequences of it. I ran this command and chkdsk restored my partition but found many errors which it recovered by writing the recovered files in a found.000 folder. These recovered files have OVERWRITEN some other files that could have been recovered by a dedicated tool. Now, if I run such a tool, it says the files are unrecoverable because they have been overwritten by the ones in found.000. If I had known that, I wouldn't have run chkdsk.

Thanks Gareth. In practice, how would the last point be done in a script? i.e. get the public IP (not a LAN ip for instance) and post it through a url.

@John, unfortunately this is where I'll have to stop because this is my main dev PC and I have no time for these next steps. But thanks for your help.

Done that and unfortunately it rebooted again after a few minutes unattended. Note that I have not updated my bios since I am always fearful to do so.