Perhaps "starve" is a bit excessive :D

A 1 Farad capacitor would deliver one Amp for one second, so .00047F is good for about half an Amp for 1 millisecond.

Your stepper driver should have built in decoupling to handle fast transients. I think maybe you are getting bogged down worrying about things that aren't going to give you problems.

You can add fuses and fat caps later if you find a need, but I don't think you will.