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There are some HV rated rotary switches out there, used mostly in old medical equipment, like 50s and 60s X-ray machines, particularly those used in dental offices. Some of them would be much too bulky for this application, but others might be small enough. I'll look around and see if I have anything rated at 1 kV to 2 kV. If not, a place like Surplus Sales of Nebraska or similar might have something in the ballpark...
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