Allegro 3977 with separate H bridge

In looking at stepper drivers for a variety of (unpurchased but one
of
the cheap alternatives is 4A) motors, I was discussing various
alternatives with one of the engineers at work who has had a fair bit
of experience with high power switchmode supplies.

One suggestion was to use the Allegro 3977 chip with the outlets
driving a separate H bridge (via some simple logic) and using the
sense inputs (with appropriate resistors/capacitors) to give the
current control.

Is this a suitable method for getting the advantages of this type of
PWM control with minimum development effort. Obvious possible
problems
relate to RFI feedback and general messing around with something I
have only a limited theorectical knowledge of.