The KS stock handle...its slightly short vs the emoto...but it works well in use IMHO
Another option for KS handles is Marko, IIRC BK ultra has a Marko handle on his Honyaki
Since Marko is familar enough with the stock KS and its profile and properties
he'd probably be a good person to reach out to if you want a new handle.
If you rehandle your KS take care to take don't shrink the emoto or you'll alter the balance or handling,
ie, either the balance will shift or the counterweight/inerial mass will be in a different place.
Its possibel to maybe improve the KS handle, but the stock knife is 'balanced' absurdly well...