Are you in the UK? I saw a new aftermarket GPz 550 D1 clutch switch listed on EB-UK for pretty cheap.
I guess it's the same as the 650-D3. ??? In the USA the 550-D1 & 81 KZ650-CSR had the same switch.
Addendum to previous reply: after more careful checking, all of the KZ1000-P models had the clutch switch wired with the handlebar control & the models after around 1997 had a modern type of switch similar to the ZN mentioned. From EB pics the ZN700 clutch perch is physically similar to the 650, but I don't know if the clutch levers are the same or swappable for oem fitment.
1981 KZ650-CSR. Competition, Sports & Road.