Forget JB weld, or any similar glue, it’s not going to hold. Tig, heliarc and brazing cast aluminum is done but the porosity of cast metal creates challenges, listen to sonny, it’s what he does for a living. It’s always going to be a patch, marginal at best, never as strong as it was. You’re dealing with a lot of weight bouncing on a lever with a mechanical advantage bolted to cast aluminum here.
I think scorp possibly offered a legit idea, maybe a bracket attaching to available bolts nearby could be fabricated to reinforce the repair?
What about making an insurance claim? Possibly homeowners or your vehicle policy would cover this. If you paid someone to move you did they have liability? Did you rent a moving truck that was insured?
Get an insurance company involved and fix it right...replace the case.