Torque converter runout

I think the run out is a great idea. Perhaps a better way to mount the converter would be to cut the back off an old crank and use it with a flex plate, chucked up on the rear main?

I have often thought of this. I had a customer once bring me an unknown "performance " converter to put in his car. It looked like someone welded it together at home. It went together without issue and properly engaged the pump and input, but after a few days of driving it broke both drive lugs off the pump. I figure it had snout runout issues.