CMSs should work with Discourse, not to mention blogging platforms. I set up a blog running on Jekyll, deployed on Render, to embed replies on it using Embed Discourse comments on another website via Javascript. It works well.
IIRC blog.codinghorror.com uses Ghost, and has the forum connected to it.
Another example is blog.discourse.org. It uses the same thing to post new blog posts in Announcements > Blog, and embeds replies in the blog posts.