Interesting idea, but I fail to see the point. Considering most sophisticated aspects of most traditional arts are NOT supposed to be about blunt force execution. The Red Man, and other versions of the padded adversary are excellent tools in short self-defense courses, that obviously bring a degree of reality to the uninitiated, and have a place with the appropriate objective.
However, as a long term training tool in an art that utilizes the weak points of the body, along with the physical manipulation of body posture through these weak areas, padding the "attacker" would not be demonstrative of the effectiveness of the applications.
It would be akin to checking the effectiveness of a bullet on a particular substance, by protecting the substance you want to test with a bullet resistant material. Pick your objective, and then counter what you're trying to find out so you do not reach the objective, makes no sense.