I don't think it's that practical to make superwash at home but of the two methods, it might be possible to chemically strip the scales off of wool at home. I do recall about a year ago, someone on one of the spinning lists complained that she just couldn't get the wool from a certain fleece to felt, even though the others did, and speculated that since she used washing soda and left that one in for a teeny bit longer, that the scouring bath might have stripped off the scales of the wool.
I also know that bleached wool oftentimes felts slower and sometimes doesn't felt at all because during the bleaching process, the scales were to some extent, dissolved off.
So it would seem that an alkaline bath would probably help protect the wool from felting, but I can't say how alkaline, or how long to leave it in. The alkaline solution would also probably leave the wool with a really harsh feel to it.