I like the idea of retipping, but on a Japanese cartridge would prefer not to use the European stylii that Soundsmith typically use (VanDen Hul, Gyger).
I would prefer the Japanese stylii (Namiki, Ogura) and for that Andy Chong at Needle Clinic is the go-to guy:
http://www.phonocartridgeretipping.com/contact.html
Best of luck in whatever route you take.