Here's a pic of my holder in place
Here's a pic of the badly deformed hole in the flywheel after the first attempt at using the pin to hold the crank to remove the bolt.
The worse problem was as the holding pin bent far enough to allow the flywheel to turn and pull out, it would no longer come back out of the hole.
I had to take the roll pin handle out find a bigger gap in the spokes of the flywheel and pound the pin into the bell housing!
I tried to use a more substantial piece of metal through the bell housing through meatier parts of the spokes: I bent a small prybar attempting to remove the Jesus H bolt.
The math above used 410 N · m of torque and I estimated closer to 650 to remove the bolt on the M62 I worked on.
I would certainly not ever attempt that again.
If the holes were close so it was a shear situation then it could hold no problem. The problem is the pin extends over an inch out to the flywheel.