Council elective does not exist.
I wanted to drop you a personal note since I removed your edit to the Succession page regarding council elective succession.
This form of succession does not exist in the game. Perhaps you were confused by reading the description of it (succ_council_elective) in the file localisation\v2_52.csv ?
Despite the existing description, the feature itself has not been implemented in-game. Please make sure to always verify that something you read about in the localisation files is implemented in-game before you add it to the Wiki.
Thank you for your time and attention!