I wonder if someone is willing to make a mod which you can find the Horn of Jurgen Windcaller inside Ustengrav, then, after you learn 15 shouts, you can proceed to learn Clean Skies and speak to Paarthurnax to proceed with the main quest. In "Season Unending", the Dragonborn makes the speech of how Alduin is dangerous to the world instead of Esbern, since he/she spoke with Paarthurnax, then Everything flows normally, since the Dragonborn are now well known after defeating Alduin, Delphine sends you a letter to meet her, since she's a blade and you, from the start aren't a manipulated puppet like a Far Cry main character, she wants to serve you as a follower instead, prior 3 days after Delphine sends a letter to you, you get an invite to one of the Eleween's parties (unless you completed Missing in Action in a violent way), since you arrive you can increase your disposition chatting with some people that weren't able to increase disposition in normal ways, or you talk to someone to make a scene and go away. Anyway, no killin partysnax bullshit, no letter instead of the horn, nice party after the end.