Static discharge of large items (metal)
If you can't just connect a 100meg resistor to ground, then "discharge wicks," tufts of carbon fiber, steel wool, or metal combs tend to work fine at reducing your floating kilovoltages down to ~1KVDC.   Below that, the sharp-tip coronas turn off.

Traditional methods include radioactives: thorium-steel rods, etc.  Perhaps a welder tip from a TIG welder; tungsten-thorium ionizer rod would be enough.

Otherwise, get yourself an ionizing blower, $50 on ebay, and aim it at the equipment.   These produce balanced populations of pos/neg ions, in other words, converting the air itself into hundred-meg resistors.