DIY Unipolar micro-stepper Mardus-Kreutz drives were developed years ago on this forum (free and open source). Even when they were developed as an educational design, they perform at the same level of bipolar parallel drives including high speed and same torque due to RMS vs peak current compensation on all micro-step modes.
They were tested driving high inductance motors (test motors were 8 wires 6.8 mH / coil). Motor heating is not a problem even at less than 1 rpm on any of the step modes available (Full, half, 1/4, 1/8, 1/16, 1/5 , 1/10). M-K drive specs are 80 Volt 8 Amps but tests have being done driving 1 A motors too. No noise come from the motors at any speed, not even at standby. Standby current reduction is standard.
I don't sell them (never did). This is not a commercial.