Looking for Kaikons and EVs will be interesting as they are primarily released in Japan. There are a couple of shops in the East Coast that specialized in JDM reels. There are also a couple of California sellers on Ebay that sell JDM reels. Good luck.
As for the handles, isn't there a custom shop in Hawai'i that machines reel parts (for Penns and Newells?) for the ulua hunters?
Found the link
Island Rocket Reels!
If you don't find the parts, you can go with the Alan Tani stainless steel handle and knob or grind off the original Newell knob from a P-series handle and just add the Tani knob. The reel below has the completed handle assembly from Alan. Good luck.