It would take more than a GPU Driver, or actually, drivers at all.

Windows has some behavior that is hard-coded and cannot be changed except by Microsoft. This behavior can fairly easily be bent on Linux, but Windows drivers can't bend the rules for some of these issues.

The biggest issue that immediately comes to mind is that the M1 MMU (Memory Management Unit) only can handle 16K pages. Linux can easily be built for 16K, and most programs work on 16K, but Windows currently only supports 4K on ARM. No driver can fix that - only Microsoft. Of course, if Microsoft joins the Apple Silicon train (which Apple has said they are more than welcome to do), then they probably will have official Apple documentation and not need the Asahi Linux findings.

The GPU driver is an important component for desktop users, but it's just one small part of what you need to bring Linux to these machines. There's a ton of work in all kinds of other areas, down to changes in the core of the kernel. A GPU driver for Windows won't do you any good without all those other drivers.