No it is not. You are proposing having the worlds biggest boxing match in the worlds poorest country. Tell me on which planet that makes sense.
Yeah, lets have a massive fight between 2 Brits in an impoverished Central African nation. That makes a tonne of sense. That being said, it'll probably be in Saudi Arabia
What is arguably the most famous (and revered) fight in boxing history? What is the fight that books and movies have been made about? Ask any boxing journalist what event they would like to if been at most and what do they all say? Rumble in the Jungle, Zaire. And it would be a lot easier to do it now then it was 50 years ago.
To be fair the same thing could happen in Cardiff, and they have mentioned the millennium stadium cardiff as a possible location.