I obviously didn't understand your circle idea - you're talking about an exclusion zone.
I was referring to the revenge attack circle, now clearly different things. I now understand.
However, I still haven't seen anything suggested that will 'attract' the winners to behave in a different manner. What is suggested will force them to do so with no benefit to them. They need a benefit to change their behaviour as without some benefit they will be truly and reasonably annoyed that the winner takes all part of the game has changed after they started to play the game on the world and invested hundreds of Dollars, Euros, UK Pounds or whatever is their currency.