I've figured out how to get this stuff done in beardlib, so I'm uploading this as an alternate to the other one. This one will require BeardLib, the other one wont.

To install this mod, put it in your mod_overrides folder. It doesn't replace anything, only adds to the game.

UPDATE: I fixed an issue with the thing that's supposed to say "This is a Dark Souls mask!"
UPDATE 2: I fixed the issue with the Brass Helmet not appearing. Turns out I forgot to rename a file. lol
Update 3: Added the auto update thing, and because of this, you'll want to delete the original folder and just replace it with this new one.
Update 4: I think I fixed the auto update bug maybe?