!!!!
Well, I've got a solution for you....
But first to answer the question, no converter exists to allow play of US HuCards on a Japanese deck. And the Kisado is quite expensive, usually $150 if you can even find one. The Mirai converter (red) isn't that reliable either.
The solution I have for you is a modded Duo! One can install a switch in the Duo (either a US or Japanese one) to allow play of the other regions HuCards! The cool part is if you have a US Duo, you can use the Arcade Card Duo to play all of the PC Engine Arcade CDRoms, like Fatal Fury and Art of Fighting.
Where might you find a modded Duo you ask? Well, look no further than right here! I install a push button switch, much cooler than the slide switches you'll see other selling. I've provided modded systems to The Chief and Conrad Hart on these forums and I'm in the process of sending one to k'_127 as well.
I'll mod your deck for $70 shipped back to you.... I mod Duo's and US Turbo Grafx decks as well! (By the way, if anyone's interested, I have a couple of modded US TG-16 decks ready to go....)
PM me if interested (sorry if I derailed/hijacked the thread a bit, but it's related....)