With your experiece and knowledge concerning turbofan and turbojet engines i doubt you would put your hands anywhere near N1 stage unless any source
of bleed air was unavailable. Anyway, from the moment that you hear the starter and to the fan starts sucking in big objects there's plenty of time to get out of the intake and walk to a safe distance.
Dunno about modern high bypass engines but the JT-9 could start with the fan (N1) strapped, heard of the fan being held during a dry motor.