Andrew Shadow
Site Supporter
If you get to this point, I would suggest a machine shop versus a repair shop, unless the repair shop also has machining capabilities.Before I get to the drill out idea I'll drop into my local shop and ask them what they would recommend and how much that would cost.
Any competent machine shop can easily remove that without damaging any threads, even if they need to drill it out. They have precision milling machines and drill presses, and more importantly they have the fixtures to mount it securely to allow for precise drilling that most repair shops just don't have. It always surprises me how many repair shops don't even have a drill press.