You're getting way too paranoid about this issue. Look! I've done compression tests on KA24 motors which involves spinning the motor without starting it; measured/set valve lifter clearances by turning the motor by hand many times. All this without any worry of cam timing jumping. If you don't believe me, go ask any auto mechanic.
Make sure the chain guides are installed correctly. It's also possible that the cam timing is way off so that when you're turning the crank, a piston is up and stopping a cam from turning; this might cause the chain to jump teeth.
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