i have, but i was going to 4a/t50. youre seriously better of serviving what you have. clutch conversion is a rather large job compared to changing a cable, which is all it will be.
what youre suggesting is completely custom.. sure you can get either ae71 or 86 hardware in there at the pedal end.. but then what are you going to do at the box? the K box will have no provion for a slave cylinder.