My problem with these techniques - particularly the first and third - is that I don't trust techniques that rely on your opponent being a weak kicker or pulling their technique. Of course, they should pull their technique somewhat for safety in a grading or training, but if your defence relies on it then surely it is a flawed defence? Hammer-blocking a kick with your wrist will just break your wrist if the opponent is a powerful kicker and doesn't pull their kick as much as you expect.
