I'm not familiar with the details of such things, but would it be possible to "port" the Intel's open source Linux GPU driver to Windows? That would make for a working driver without this junk
Even if you were to overcome the massive hurdle of porting a driver between two completely different kernel architectures, you would not be able to load it without enabling driver testing mode at boot time, or without buying a code signing certificate.
Hmm, would that be a massive hurdle? I haven't looked at that driver code, but I have done a lot of driver development for both Windows and Linux, and have ported a number of drivers between the two. Sight unseen, it's not obvious to me that this would be a huge hurdle.
The code signing is an issue, but that's a manageable one.