I will check it soon. 10% is simply terribly low chance, and it is not pseudo random, so it can be not triggered for some time. I made a prototype of Henry Walezy's Poland, not sure if make new mod or add it to Love and Life. Spoiler : Choosing new leader after one turn elapsed and then on each new era. UU/UB are gonna be as neutral as possible to not impact on player's decision. Random 10 leaders will be avaiable each election (already used ones are not gonna be available again). If possible, leaders existing in game are not gonna be selected.