These articles describe the vTaiwan system, developed in Taiwan to build consensus.
"People compete to bring up the most nuanced statements that can win most people across" different factions.
It includes an iterative process of proposing new statements on a topic, and then voting on the statements. Over time, statements are developer which more and more of the voters agree with.
Check these articles for ideas how that might be accomplished:
https://news.ycombinator.com/item?id=22203937
https://news.ycombinator.com/item?id=21362182