Thanks for the suggestions, I am not much of a programmer myself, many are both better and faster than myself.
I did however continue my search yesterday and found this:
1. A Github project with an already tried and tested blacklist:
https://github.com/splorp/wordpress-comment-blacklist/
2. An existing plugin which fetches both the above mentioned list and possibly your own additions from a central domain:
https://wordpress.org/plugins/commen...t-manager/faq/
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The truth is not affected by the beliefs, or doubts, of the majority.
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