It is a good idea and it would be fun to see everyones effort over the year, but unfortunately this is virtually impossible, even with some really extensive efforts — and when I say really, I mean reeeeaally!
Look at this page for example:
(I edited out the names for this post, you can check the stats in-game anyway)
Only the top 5 players shows up on the list on this page. Now, if I wanted to find out who is rank 6, it would be possible to look up that person stats if I knew his or her name. Because the tool for searching the player database only allows you to look for name or GUID, so not ranks or anything like that.
So in short, you'd have to find out for yourself at the end of the month, right before resetting the stats who the 50 top players are and write down their stats manually.
Only solution I see, would be limit it down to top 5 of the year and take a screenshot (which I do before I reset the stats and post them on the forum) and save each month stats in a folder (which I haven't
) and then add up at the end of the year which Rebel made the most kills out of the top 5.
Oh and keeping two separate logs, one for resetting and one for saving isn't possible either because the tool we use isn't built like that. I hope this somewhat answered any questions, even if it probably wasn't the answer you wanted.