If I ruled the carribbean,
I would start off by allowing Pirates who are fully mastered and have completed all quests to sail the Black Pearl out of boss Battle, but with a Different name and a lighter hull. I would also remove the repair minigames and just do the hammer mabobber.
I would also add a second chapter with the headstone and it involves the EITC. It would invovle a boss battle at the top of Kingshead with Cutler Becket Lv 100. He would use Silver Freeze Knives ( Mercer's Blades included EITC and Becket 
), and A famed broadsword. You would have to fight him in waves, in which EITC Assassins run out in masses and swarm you. When you defeat him, You get the Cutlass of Becket which would be a legendary with a power of 112, and would have every passive, Immunity/Ressistance, and skill +7, and would have a Break ATtack of "Goonies" Which would send out 7 Pirates proportional to your level* and attack your foes while you get a 75% health healing. Your other sword options would be le Porc's Sabre and Avaricia's Broadsword with a damage bonus when used against another player with the opposite weapon in their inventory**.
Everything in pink is only for fully mastered prates with no quests left to complete. Your would get the 2nd chapter immediately after you fit every requirement.
*The weapon can be looted but the chances of finding it are equal to finding 2 different legendaries in a chest together. It would be half your level, and if your level is odd, it would round down to the nearest whole level.
**In PVP, also allows you to attack another player with the weapon's opposite outside of PVP. Can be looted.