I used a receptacle/plug combination as a disconnect for my Oneida cyclone in the closet. While I'm using a contactor with 120v remote control for switching the system on/off, the principle is the same as for what you have. You just have more bells and whistles at the "control". I have a single, centrally located wall switch. There should be some way for you to properly extend the lead between your control box that will live in the shop and the power connection equipment in the closet near the cyclone. Yes, that might require using j-boxes, etc., but in the end, it's only going to take you a short period of time to wire that in and there will be no concerns about the legitimacy of your wiring should the unthinkable happen.
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The most expensive tool is the one you buy "cheaply" and often...