Perhaps a better way to do this is with optocouplers. Some stepper drivers have optocouplers by default for the control signals. With such a device then yes you can use different psu because the control signals are galvanically isolated from the driver, the information is sent as light, but otherwise the two circuits have nothing with each other. The two circuits are only coupled by light. So i think opto isolator could be used on the step/dir/en lines, it converts one side to light, than to whatever voltage is on the other side. This is much better option imho than other hacks. Although ssr internally kinda do the same thing, e.g. convert to light to "couple" the circuits, probably wont work at the speeds that board does, e.g. for step signals.
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