Importing Tens Of Thousands "Unique" Articles To Wordpress

I now use strategies where I work with tens or even hundreds thousands of key phrases on one site. I would like now to try make every article I use more unique. I wanted to do this: add spintaxed articles in CSV and import it to WP with some CSV importer that supports spintax. I was searching google for several days and found no CSV importer than can import spintaxed content and post it as readible spinned content. I have several projects ready that need me to solve this problem. I'm sure there is other way how to do it. I tried spiining articles before importing to wordpress, but found none tool that cna handle such big amounts of articles without errors, but there still might be some.
So how would you do it? For example you have list of few thousands key phrases and you have few "general" articles in same niche into which you can implement those key phrases and you want to make thousands of versions of these articles and publish it on wordpress. Thanks for any ideas