You could keep the current legal system and use the “Keynesian beauty contest” as a way to evaluate judges for retention. Are their actual decisions likely to win the “Keynesian beauty contest”? If not, that could inform the decision whether to retain. Once the community has seen the “KBC” functioning as a useful tool, it may be easier to consider implementing something like your KBCJ system.
You could keep the current legal system and use the “Keynesian beauty contest” as a way to evaluate judges for retention. Are their actual decisions likely to win the “Keynesian beauty contest”? If not, that could inform the decision whether to retain. Once the community has seen the “KBC” functioning as a useful tool, it may be easier to consider implementing something like your KBCJ system.