Hello Fed, it sounds like you have your own idea of how Gen Rel should be quantized!
I am not sure how it makes contact, however, with the current work of Carlo Rovelli.
Have you looked at any of Rovelli's recent papers, say since 2005? I don't see any point of contact. Maybe you could designate a recent paper, since 2005, and point to something there, on some page, that we can look at----that is somehow related to what you say.
You say Rovelli is in denial about the manifold M. What is he denying about M?
I really need you to tell me a specific paper and point to a section of it, on some page, where he is in denial about some manifold.