Alternatively, we can implement projects to incentivize flagging via community review. @steemflagrewards is something I started for such a thing. Not sure if you had an opportunity to see this and way in on it. Its still in it's early stages so is evolving. Your feedback would be appreciated.
This could even work in conjunction with a split voting pool as you described. Here's the latest. I plan to work on simplifying my language a bit to put it in more layperson's terms which should help get additional support. The one below is a bit technical so understandable why it may not have received as much popular support.
https://steemit.com/flagging/@steemflagrewards/steem-flag-rewards-progress-report