Instead of looking for good "crypto writers", why don't you just look for good writers, period? People with experience in creating content (blog posts, white papers, books, academic papers) with sufficient technical background to be able to write about crypto.

Anyone with sufficient technical experience to actually develop crypto will probably have the writing experience anyway, as this is part of the job. You always have to write reports, technical descriptions, etc. If that isn't enough, get them coworking with a pop-science and tech writer: one of them makes it accessible, the other makes sure it is rigorous.

So in summary, drop the crypto tag: look for a good writer.

I actually know a few if you are interested.