Just flush out the plunger once a year with WD and you will be fine!
I covered this in post # 7. Kawasaki will do this for free for all older bikes through a TSB, although the dealers may be reluctant as it is pretty involved and the reimbursement from Kawasaki is small to the dealers.
The main issue is grime building up in the couple of inches long square plastic plunger to the switch that is located under the ignition switch (making it sticky). On the older bikes, you can barely see the metal tab that pushes against the square plastic plunger at the 10 o'clock position next to the key hole. If your bike will turn on, you will see the plunger up against that tab, if not, you will see the plunger stuck in the square hole held by the grim buildup. This stuck plunger keeps the switch activated and the ecu sees the activated switch as an error when turned on again.
The newer bikes not only have the stronger spring but more importantly have a couple of shields around the square plunger to help keep the grime out.
Am sure if you just clean it out once a year with some WD, you would not have any problems. The stronger spring just helps push against the grime.
As for the security bolts, they will break off when trying to remove them but can just be replaced by regular bolts.