I am on Xbox, otherwise I'd do this myself; I know that the PC version has the console which lets you do a lot of things. What I need is for someone on PC to take my save file (which I will have already converted to PC format) and use the console command to drop "The Old Ways" and pick it back up again, thus restarting the quest and fixing the bug. After this, you will save, and send the file back to me so I can convert it to Xbox format once more and therefore have a bug-free quest.
I just need two things: someone who is willing to help me out, and a way to send save files over the Internet. I don't know how to do the latter one.
I am now going to bed, so anyone interested should private-message me and I will get back to them tomorrow.