You're welcome!
By the way, let me share with you some experiences from when I had the blog alongside the site.
Still on CI3 I created a section on the website's home page where blog updates could be viewed, summarized, with the respective link to the post. It's not difficult or complicated, just identify in wordpress tables where the necessary information can be found.
As I am the site's entire audience, I have no users, although on one occasion I did a simulation of the existence of users, out of curiosity, in an attempt to learn and understand how it works, but I ended up giving up because it was not within the site's objectives .
I'm mentioning this because it's possible to avoid redundancy of user tables. I believe it will take a lot of work, just imagine the issue of privileges, but I think that the experience gained and the personal satisfaction of winning this challenge pays off, a lot!