I'll go look for your thing, but this isn't two separate pools (since that is yet another idea).
My main point was that the abuse is going to happen anyway. And we need crowd sourced downvotes. Maybe your hybrid has the same problem, maybe not.
Then you might consider a downvote reversal committee as well. We have some of those around even today but could probably have more support.
Edit: oh, in fact that's what you were proposing. I misread the first time sorry :)
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