It might not be as bad as you think. The WordPress platform is chosen for reasons much more than just being a content editor. The extensibility of it to provide things like social sharing, comments, and an editorial calendar make for giving it a worthwhile look. I wrote up a how-to guide on getting Wordpress to play nicely in Rails via reverse-proxy that I just re-used myself and I billed out 60 minutes of work.

That post is here if anyone might find it helpful in looking at all of the options: https://medium.com/@parterburn/wordpress-inside-a-ruby-on-rails-app-c324fbf39ad8