You may want to look at the shifter lever from the 98-00 Honda CBR1100XX (Black Bird).
I use them on my 2000 I/S and on my 98 Standard "Rat Rod". One of the best and cheapest modifications you can make. And it's all Honda!
Does it work with Rattlebars Kickshifter ???
I doubt the blackbird shifter would work with the Rattlebars kickshifter, as it moves the location of the shifter.... probably beyond the kickshifter forward hole.