Player rating for tournaments across all installments of Heroes.

No way, if you've decided to start calculating, do it yourselves :D No need to shift the burden onto others. I'll help with the calculation part and make a template for you. You'll only need to copy and paste the numbers there...

Later on, someone will also have to handle the aging process, not counting the current rating if they missed it—it's quite a hassle, so you'll be consulting based on your template then. I might send mine over, so you know what kind of explanations to expect :)

I'll calculate for all 26 participants. We'll see from there. As for the two saves in the tournament—I think we can overcome that! Or we simply won't count those who play on a low difficulty level—we already decided that...

And if they already have some rating, will it be impossible to age it? Damn, there are still going to be misunderstandings :)
Anyway, we'll figure out the aging as we go; for now, there's nothing and no one to age :)