If it were me, I would only wonder whether there are any similarities between an "old" Kiseki Purpleheart and the new revival of the Purpleheart, with respect to construction and performance parameters, before investing. Chances are, the resemblance is limited. So, you would be buying the name only, if you buy a new Purpleheart. (Well, I guess the body of the new one is made of purpleheartwood, like the original. That is something, at least.) I always thought that the KP was made by Sugano before he started up Koetsu. Beyond that, I had no reason to care. The old KP always had a good reputation for sounding good, however.
Can you find out about weight, compliance, voltage output, cantilever type, stylus shape, inductance, etc, for old vs new? Did the old KP have such a high internal resistance as you mention for the new one? The high resistance suggests high-ish inductance compared to most LOMCs.