I would be scared stiff of hand cranking a Rotax
Rotax are marginally safer than Lyco/Conti, in that respect, since they are supposed to be shut down by selecting the mags Off (not by pulling the mixture lever, which is missing). So the chances of leaving the aircraft parked with a dormant live magneto are somehow reduced.
Obviously you still have to make sure that the mags are Off and the keys out, before getting near to the prop.