There's already a Rust OS[1] built on top of a brand new Rust kernel, but even if it gets all the traction possible, it won't have proper hardware support before several decades (see the current state of Linux, which is better than ever, but still far from perfect).
You will get some drivers at most, so maybe you could architect this drivers in such a way you could re-use part of teh code on the alternative kernels.
What is missing is someone with big pockets to pay very competent engineers to work on such kernels full time and setup a decent test lab with different hardware. Hobbyist might take a long time to finish the job.
There's already a Rust OS[1] built on top of a brand new Rust kernel, but even if it gets all the traction possible, it won't have proper hardware support before several decades (see the current state of Linux, which is better than ever, but still far from perfect).
[1]: https://www.redox-os.org/