I am in a similar position, and I would fully endorse the 'just pump something out' approach.
I have done all of my secondary reading and made notes amounting to about 16,000 words for a dissertation that should be a max 15,000! Even though most of the words I currently have are other people's, and not my own, I can order them, start to get a shape for the dissertation as a whole, and then just work through it, piece by piece, writing my own work and taking out all those bits that turn out to be extraneous. It is a lot easier to work withsomething on the page than with a complete blank!