mengyei

It's been 7 year, but it's done. BEHOLD! https://www.nexusmods.com/skyrim/mods/102538

Improved version on Destroy the Dark Brotherhood, where a different Listener was chosen, and the Dragonborn teams up with the Penitus Oculatus to foil the Dark Brotherhood's schemes: such as saving or solving the murders of Narfi, Ennodius Papius, Lurbuk, Deekus, Vittoria Vicci at her wedding, discovering the plot to kill the emperor, and saving and Emperor Mede on his ship in a final showdown with the Listener. Alternate start of quest begins when walking into Honorhall Orphanage to find Grelod recently murdered.

Improved version on Destroy the Dark Brotherhood, where a different Listener was chosen, and the Dragonborn teams up with the Penitus Oculatus to foil the Dark Brotherhood's schemes: such as saving or solving the murders of Narfi, Ennodius Papius, Lurbuk, Deekus, Vittoria Vicci at her wedding, discovering the plot to kill the emperor, and saving and Emperor Mede on his ship in a final showdown with the Listener. Alternate start of quest begins when walking into Honorhall Orphanage to find Grelod recently murdered.

Vigilant. If there's a quest mod to end your playthrough, that'd be it.