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well, at this point you really only have 2-3 options find or make a tool to hold the crank in order to achieve your 200 ft lbs. of torque and give it another try or get a new crankshaft lot of dynamics at play right there. torsional, vibrational, heat, etc. it's a 6200 cc beast that's...

Yep, I've seen pressed on balancers run without a bolt even present and not come off

Yeah, good point for sure. shouldn't the balancer need to be pressed or pushed on with a tool? if a new one just slides on then for sure the snout of that crank is out of spec. I just re read the OP, and it says he tried to weld it and it still came loose and shattered the weld. who knows how...

there's likely hundreds of these made for this exact task by Kent Moore or OTC laying in a conex box in Iraq that nobody knows or cares what they're for. probably using them as a charm necklace for their camels

I'm not familiar with the 6.2, but I think I know what you're saying. you need a wrench like this that will hold the balancer while you torque the crank bolt maybe you can fabricate one from a nice thick piece of 3 or 4" flat stock. don't worry about the square drive hole. just lay it out using...

just hold the crank however you have to. by the starter ring gear, by the pulley, what does the TM say to do? here's a holder for a Duramax. I'm sure there's one out there for your 6.2

Use a chain wrench to hold the crank pulley while you torque the bolt. use a old timing belt to protect the pulley from the chain wrench. If your crank is shot, just weld the pulley on, worry about it when you go to replace the crank