Both the Windmill Slayer and the Corsair's Pride can be found in the stock game.
I don't do the quest to get the Windmill Slayer, but if you want to do it, here's how:
Start a new game. Wait for Malcolm Hatcher to come and talk to you and tell you to get your items. Go get your items and talk to him, he will tell you to equip your sword, pistol, and spyglass. Equip them and talk to him again. When he offers to teach you about swordplay, tell him to instead continue with today's schedule. When he talks about skills and abilities, tell him to continue with something else. You will now go to the port, and when he says that you can buy a spyglass now, tell him that you will do it, and he will tell you to follow him. Now kill him. You will get a message about killing your teacher. Now go to the town gate and enter the town and then exit to the port again - Malcolm will have respawned. Kill him again and repeat this until you reach level 6 - I guess it's "6" because of its connection with the Devil. Now sail to Quebradas Costillas and go to the "Strange house". You will get another message. You will now have the Windmill Slayer in your inventory.
I don't know if this method works in Build Mod 14.
The only way to get the Corsair's Pride is to find it on random officers in the taverns and exchange it for a sword they find "better". Exactly what constitutes as "better" I don't remember.
I hope this helps.