I don't think you have put enough thought into this.

Currently, there is 140,623,980 HP, ~70 million HP is required to do a Sybil attack or 51% attack on the Hive network and elect the 17 witnesses necessary.

If your 1:1 proposal is enacted, ~7 million HP would make it certain 1 specific witness is in the top 20. Now (30 votes each) >50% is needed to get 1 or them all.

At a 1:1 voting (sliding scale doesn't matter and is probably a disadvantage if it is a coordinated attack), if everyone is voting ideally (impractical) ~200 million HP would be required to definitely have a 17 witness consensus making it much more difficult to attack this way.

However, ~ 28 million HP would be enough to get 4 witnesses in the top 20 (much easier to coordinate only requiring a few of the top whale accounts). If there are 4 witnesses not agreeing to a consensus, there is no consensus and hard forks are not possible. They could make whatever demands they want to change their vote. Until it is changed no hard fork is possible without creating another chain like Hive 2.

If you are thinking Bah this would never happen! Please check out the most recent history on Hive/Steem where it happened when >50% (the current amount) is required to mess things up.