Cylinder Toggles

installing a switch on a regular 12 kV spark plug wire?

I need to cut 2 out of 6 cylinders on a hot rod engine retro fitted in a power boat. I want to do this while shifting from neutral to forward or reverse since there is no clutch. As the engine idle RPM is a bit too fast, I want to cut 2 cylinders while shifting to reduce the impact on the stern drive mechanism. Any ideas… a regular toggle switch on the spark plug wires won’t do the trick on the high voltage ignition …
this engine has 3 carburators…
and its minimum idle, due to the hot camshaft, is in its 1400 RPM…

dont open the wire with a switch,short them to ground with a switch.

Cylinder Toggle Assembly

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VE Ralph Aluminum D Size Oxygen Cylinder With Toggle Valve $81.28 Aluminum D Size Oxygen Cylinder A lightweight, aluminum oxygen cylinder with a convenient and time saving toggle valve. It has industry standard posts and meets or exceeds all Department of Transportation Specifications. Capacity: 415L. Fill pressure to 2000 psi. The product referenced on this detail page is sold be Each….

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Aluminum Oxygen Cylinder, M6 w/ Toggle …