@ Bill
My Bad

- the phases for a std stepper are 90 degrees out of phase. Not sure it would make much difference as this would still put the rms value @ 110 volts, and most of these chargers will work down to 90v or less depending on load. I would think that is worth a try.
Technically better option as you say is to bridge rectify both windings, with capacitor smoothing, and connect the outputs in series as this will result in the smallest motor load.
@ Benchmark
Half wave rectification results in a dc current flowing through the windings which is likely to demagnetise the magnet in the motor. Much kinder to the motor to use fullwave rectification, as it reduces the current peaks into the load and works the magnetic motor components about the centre point. If it helps think of it as an unbalanced flywheel .. . it will work but the bearings will be shot in no time.
The R in the circuit is the load. Without an input capacitor the average voltage is 66 % of the peak - so 75 volts is 106v peak, or 70volts average. As its half wave rectified you would think 35 volts but things are much more complicated than that. As an example, a 35 ohm resistor will draw 1 amp at 35 volts, dissipation 35 Watts. However doubling the voltage will give 2 amps but 140 Watts.
IMHO try the two windings in series and a phone charger. Its quick to do, and will allow a large current draw at a lower voltage which is what you need for LED's and bling lamps. As a bonus the output is isolated so no nasty shocks.
The frequency of operation will not matter much for a device like this.
Good Luck
picclock