I really don't have the energy to respond to all of this, but I'll point out that the main reason that you probably haven't heard of many people doing the exaptation/naptation method in general is that it's a recent (~2y) innovation.

ETA: To elaborate, Bayesically, the question we want to be asking is not "of the successful adapters, how many used which method?" but "of the people who attempt each method, what proportion are successful?" Not that we can hope to get an accurate answer to either by googling. What we do have is the advice of Matt Fallshaw (who has coached a number of people through successful adaptations (myself and JGWeissman included) and he recommends this method. We could ask him how many of his coachees have been successful.

And then for more on going uberman=>everyman, see this page on Polyphasic Society:

There are 2 main methods of adaptation to the Everyman 3 schedule.

One of these methods, and often considered the most effective method, is attempting to do Uberman for as long as you can, then falling back on E3 when you can do Uberman no longer.