No. Do not compare WDM Network/Audio drivers to GPU drivers.
Windows 9x never did and never will support Windows 2000 GPU drivers, especially when thinking about their 3D acceleration, end of story.
WDM drivers are sometimes intercompatible between Win2000 and 98...but this never included video drivers, mostly just network and audio drivers, and even then it's not guaranteed.
You're not the first person to think about this and all conclusions have been done long time ago.
There is no breakthrough to be made unless someone is crazy enough to write a new Win9x GPU driver including proper 3D Acceleration for whatever NVIDIA/AMD/Intel GPU they want.
Closest thing we have now is SoftGPU and its components here: https://github.com/JHRobotics?tab=repositories
But so far he is implementing just DDraw acceleration, no Direct3D...and this is only designed for virtual machines.
I don't know if it's possible to rewrite his VMDisp9x driver to be a universal one like VBEMP. Then, we could in theory use his Mesa/Wine ports to have some kind of universal 3D Acceleration, even if fully dependant on software (CPU) rendering.
Dependency Walker righly so says to you that the GPU driver relies on VIDEOPRT.SYS, a NT video miniport, which is a fundamental difference between NT and DOS-based Win9x systems.
If there was somehow a way to port NT display driver subsystem to Win9x....would it still be 9x at this point? Sometimes we need to say stop.
Here's a good read:
https://www.codeproject.com/Articles/12878/Driver-Development-Part-6-Introduction-to-Display