Another subject IS: 'Would CURRENT consensus witnesses agree with such a drastic change? (they're obviously not).

If public opinion is strong enough in favour for such changes then any push back from witnesses would basically spell the end of their position at the top.

Historically the current witnesses have been generally in favour of governance fixes. Donno if that has changes recently

We could even try to allow voters to receive a fraction of the rewards that witnesses decide to give away. If people are incentivized financially they will do it (proof of voting or something like that).

I had thought of suggesting some sort of incentive to witnessvotes.. But if it's something a witness can set it would be liken to vote buying. Doesn't look good really.
Now if the system in general gave you like what and extra % of interest on HP so long as you have 20+ witness votes that could work. And it could even be a parameter witnesses can set with suitable limits in place to prevent strange wild changes.