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The 6 pin transformers are actually 3 separate coils and not center tapped like the 5 pin. It looks more like the circuit in those bug zapper flyswaters. Get one of those, I’m not sure about the output voltage or how dangerous it is though
No a MOSFET won’t work, as stated in the Instructable
The problem is, pass enough current to make stainless corrode and you will be releasing hexavalent chromium. Not something you want around.
You could use 2 spdt relays and 2 momentary switches or a dpdt toggle switch to move the drive (or any simple dc motor) both directions. Here are quick sketches of how that would be wired.
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