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Has anyone looked into the viability of a Linux driver compatibility layer to help solve the problem of the lack of drivers?

For example, something like NDISwrapper allows you to use Windows network drivers on Linux.

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Other prior art is DDE on HURD, FreeBSD drivers on Haiku, and NetBSD rump kernels.

FreeBSD has a pretty broad linuxkpi layer for Linux drivers on FreeBSD as well. E.g., the Mellanox FreeBSD NIC drivers are really Linux drivers running on this framework.

Things like this typically require a monolithic kernel.

NetBSD's rump kernel drivers might be portable to userspace

Not necessarily,

https://en.wikipedia.org/wiki/MkLinux

https://genode.org/documentation/api/dde_kit_index

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