I have for a while thought that George should simply have the last two books ghostwritten by a team of writers with him as "producer and editor". Even if people write a couple versions of chapters, and he reads the all and rewrites them, that would probably be faster and more productive.
Not to take any words it gives but read what it says and decide if those things are true, if so, make edits. I am not saying it is a great editor but it is better than any other resource he has access to as a teenager. Yeah better than me or his mom