I have a General 26020 VFD lathe and made a remote switch speed control for it quite a while ago. I don't know about the Oneway switch but I'll caution you that (at least on my 26020) the ON/OFF pushbuttons on the pedestal have the 240VAC line voltage connected to them - not a low control voltage. These switches actuate a relay in lathe that switches the control voltage from the VFD on and off.
I elected not to extend the wires to the switches to my remote box because of the voltage so I made some mods.
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- Remote switch