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The choke should stay on in any position you set it. Should not return on its own. Something is wrong there.
I would have said heat to soften the the hard thread lock. Maybe you didn't get the temp up enough to soften the Suzuki thread lock?
Next I would say shock - blip them with an impact driver set at a reasonable torque. Maybe the shock would break the crystaline thread lock.
Last thought, on old recollection, is Kawasaki's thread lock is the rubbery stuff, and doesn't seem to set hard like the liquid thread locks do.
If those ideas don't help, then all I can think I would do is combine the techniques, if you run into trouble with the Kawasaki rotors.
Eta: A tight fitting key, tapped with a hammer to set it into the base of the rotor bolt's head. Keep the tension down on the hex bit.