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I imagine the "proper" way to do it is to use the Cummins tool that inserts into the block's access hole to manually engage the flywheel with a gear on one side and a square indent on the other and then put a breaker bar in that tool.

On my old V8 pickup engines I used to put a breaker bar on the crank pulley bolt to resist turning. Maybe doing the same on the accessory drive nut would work?