Reviewing the situation, I'm forced to admit that Dr. Becker's protocol is limited to replacing body parts. It is not designed to elongate them, nor improve upon their specialized functioning. I believe the foreskin is an excessive growth of the penile shaft skin due to the presence of progesterone, and other pregnancy related hormones, while the boy child is inside of his mother's womb.
The increased density of nerves towards the tip of the foreskin is evidence of a sexual enhancement by comparison to areas of shaft skin further down towards the base of the penis. This increased density of nerves is not evidence of an immediate survival characteristic, such as: the stoppage of bleeding. So, the healing and regeneration of Dr. Becker's protocol, while it can supply the missing part of the body lost due to accident, amputation, or illness, may not be able to extrapolate from existing body parts more developed functionality (which the foreskin is an excellent example).
Plenty a guy would like to do more than merely stimulate mitosis and grow "more of same", ie: more penile shaft skin with the same density of nerves. And advocates of penile enhancement techniques, when considered alongside the protocols for stimulating the growth of a faux foreskin through tugging and pulling the remaining shaft skin left behind after circumcision, both express the possibility of a ratio developing between how much elongation of the penis can occur versus the elongation of a faux foreskin whenever pursuing either of their respective protocols. The elongation of either the penis or the shaft skin may get ahead of the other, or their comparative growth rates may keep pace with each other. This tells me that a foreskin is not evidence of the healing (closure) of a wound. For that, we normally get scar tissue formation. Traditional tugging of the penile shaft skin does not produce scarring if done without intent to "stretch" the shaft skin into submission, but in a patiently leisurely manner to merely stimulate growth over a period of many years. What this ratio difference of penile enhancement versus shaft skin enhancement tells me is that there is some factor, other than regeneration, behind the growth of a foreskin in or out of the womb, because it tells me that circumstance -- not DNA -- dictates foreskin length.
Thus, whether the guy elects to tug on his penile shaft skin, or whether he chooses to stimulate it with mild doses of electricity with or without the use of silver, the most he could expect to achieve is to cover the shaft of the penis with skin and not dictate its excessive length, nor its density of nerves. This should hold whether or not recutting, ie: recircumcision, precedes the recutting. I believe that one or more hormones related to pregnancy, and/or lactation, are directly involved with determining the length of the foreskin and possibly another set of hormones, or else the same ones but in different proportions, will effect the length of the penis.
It's hard to say without experimentation. Yet, it's also hard to imagine that Dr. Becker's protocol is adequate to regenerate a foreskin.
I believe the foreskin is a special case of the regeneration of missing body parts to which Dr. Becker did not have the opportunity to address.