Hi Frank,
FWIW:
1. Hand cranking is always extremely safe on "your" Model A that "you" know that it is timed correctly.
2. Hand cranking on somebody else's Model A or B engine with "unknown" timing can "always" be extremely dangerous.
3. For example, my Dad operated a "Car Garage" from 1920 - 1932 & mentioned many very typical vintage scenarios:
A. Drivers pulled up every day, all day, with many different vintage vehicles ....... they turned the ignition switch to "OFF" ....... then told the mechanic(s) that their battery was weak or almost dead, plus other mechanical/electrical deficiencies.
B. Not knowing "who" last timed this vintage engine, nor "how" it was timed, the car usually had to be started to drive it into the shop.
C. Prudent vintage mechanics kept a length of large rope to fold in half, place it around the end of the crank's handle, & pull it upwards to start the engine while wearing a pair of thick gloves.
D. If the engine kicked back violently, the rope slipped, but caused no broken thumbs, hands, arms, or bones.
4. If on Model A tours or outings today, if one of the other Model A owner's battery appears weak, & cannot start the engine, a normal reaction may be for someone to step forward to show how Model A's may be started with a crank.
5. FWIW: The rope trick worked back then & can work today to save a most sad trip to the hospital.