Not bad at all! I will definitely use this tool regularly.
Now my idea also includes something that kind of pings those who votes for dead witnesses. For example, you check which witnesses are dead, you fetch the top 20 voters, you add that into a weekly/monthly report mentioning them.
The tool you made is very useful, but it requires users to know about it and to think of using it. So it would be nice to have another tool that poke them from time to time.
That's an awesome idea, I'm going to start reporting to alert these accounts.