Dear @lewm : As almost everything from the Koetsu begin Sugano likes that all about his cartridges been a " mystery ". In the past we can't know even the output level or tracking force because Sugano dis not disclose it
I owned several Koetsu cartridges and that " mysteries " are really BS.
About the stylus shape they said " it's made it especially for Koetsu ". Who really kares but you.
The best stylus shape today and from several years is the Replicant 100 that's the same as the one by vdH and the same coming by Expert stylus.
If you want the BS stylus shape then you have no alternative but to be retipped by Koetsu.
Regards and enjoy the MUSIC NOT DISTORTIONS,
R.