I know that impact sockets are not as hard as chrome, and a lesser quality socket such as those found at a "popular freight tool retailer" might be easier to machine, but still be adequate for the intended final task?
It already has the 3/4in square hole in one end, and already has the bore for the most part. The only mods needed would be to turn the ID to finish dimension (knocking off the teeth) and drill the cross hole.
Granted, some carbide tooling may well be required. Anyone reading this ever done such an operation?