I did something like this a few years ago but it's on an old computer and I can't be bothered to dig it up.
Nice idea, I will be willing to help out. One of the things I found was that it's better to use number of days as champion rather than number of title reigns as people like Cena/Orton have over 10 title reigns but some of them were like 2 weeks or less, whereas Bruno had 2 reigns for a total of 12 years which I think is a better achievement.
IIRC, number one when I did mine was:
although I wasn't completely happy with the points system I used. And it was WWE only. I started doing an all round one but didn't get very far.