Any machine shop can set it up and get it out with a carbide end mill.
I have done this a lot. Crank up the RPM's and slowly cut it out.
If I still was on my tools I would help you out.
Electrical Discharge Machining (EDM) is probably the easiest way if you can locate a facility.
I would assume that these new water jet machines would work also but I have never been around those.
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