imho that all sounds very convoluted and impractical.
why make a complicated solution to a simple problem, responsible vote-selling (promotion&investment) policies.
I am absolutely pro vote-selling, if that's not "publicly available" it's just going to happen under the counter and will be even less accessible to the "average-joe" on steemit, leading to even more reward skew towards the established players.
Making overly complicated rule-sets (that would have to be implemented on the chain to be effective) is just not practical when the problem at hand is really mainly an ethical one stemming from quality expectations and economic understanding about this platform. It should be solved as such.