> Incidentally, your proposal is basically the same as the already existing 6to4 scheme (not to be confused with the more traditional manually configured tunnel, 6in4)
You have highlighted why people look at the "upgrade" path and decide it isn't worth the annoyance/uncertainty it until it becomes necessary. The fact that there needs to be a "not to be confused with" caveat is not good and the "already existing" was made up after the fact as a bodge, not as part of an intended thought-out path.
Useful recommendations were non-existent in the beginning and are still badly vague. When I read a how-to guide I want something with a clear path to a successful result, not a fucking "choose your own adventure" book.