Hey U007D,
CNC Depot, which offers
High-precision, quality spindles, manufactured and supported in the Unites States!
makes the FM30F spindle (brochure), which is a
3 hp ISO30 220 V 12,000 rpm Steel Bearings (4-pole motor, for higher torque at lower rpm)
spindle with a ISO30 tool holder for automatic tool changer.
However it will not fit the Onefinity spindle mount, you’ll have to exchange your Z assembly by a universal Z axis assembly (see also here). See cncdepot’s downloads section for the spindle dimensions.