125-200cc Clutch Perch

Anyone know if there's a japanese oem that will work for the late model 125s (2012 WR125)?

pretty much any clutch lever will work if you sort out the length, that said
when the factories set up the bikes they take into consideration clutch springs throw length and pull, yours is a cable and as such you need to consider what bikes still use them,,, none, on that note look at the Motion Pro cable line they offer a Terminator if it's the friction of pull that is at issue
I tried using different clutch perch and lever combos and found the stock Domino was a top drawer item for sure