Two pole works fine 
The alternator chargeback wire: take it to the battery side of the cutoff switch (this happens to be the starter wire also)
Does it leave the big black heavy wire "hot" running through the car AFTER you cut the switch? Yes, but all else is cut.
Super simple to wire it this way, I use the Cup car style electric cut. ZERO failures in 10 years of use. Easy to wire a switch for the driver and button for the outside of the car.
The "twist" style cutoff SUCKS to run two cables. One for driver and external pull 
B
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