It has been standard practice for inductive loads for decades.
> It would definitly discharge the field's > inductive kick when the contacts open, but I > think that you would still want some protection > on the contacts because they still have to > break the current going to the field.
No it doesn't: that's the point. The current simply transfers to the diode. Since the current through the inductance is not interrupted there is no inductive kick.
In some applications one adds an RC snubber network to bring the current down more rapidly (at the price of some inductive kick) than the rate determined by the RL time constant of the winding but that should not be necessary here.
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