Can Nouveau be used for GPU offloading on Nvidia Optimus systems?

I own 2 old Thinkpads with integrated NVIDIA GPUs. These GPUs cannot be replaced or upgraded.

The NVIDIA legacy drivers needed for these GPUs do not run on Linux kernels above 6.5. All current and recent versions of Debian, Ubuntu, Fedora, Arch, and Alpine all use kernels too new for these drivers to work.

Unfortunately NVIDIA's Optimus technology for software GPU switching and offloading to the discrete GPU only directly works with NVIDIA binary drivers.

The Nouveau driver does still support the GPUs fine, though.

I can't find any HOWTO or docs new enough to discuss using Nouveau with Optimus on kernel > 6.5. Does such a thing exist?

Better still, is there a tool I can run to configure this? It could be simple: any Nouveau version works with all the GPUs it can drive. No system-specific or GPU-specific config should be needed. Even a single config file and a list of dependencies would help.