There could be a council of highly respected people as one layer in the peace enforcement governance process.
Examples might be Desmond Tutu, Aung San Suu Kyi, Jimmy Carter, Thich Nhat Hanh, and Nelson Mandela.
One possibility would Nobel Peace Prize winners. However, that would politicize the selection of future Peace Prize winners.
Another possibility is former United Nations Secretary Generals.
Perhaps this council could be the body that appoints the overall commanders of the peace enforcement brigades.
Perhaps this council of elders could be elected by a larger body which was in turn democratically elected by the people of the world. One possibility is an Assembly of Peoples.