I like the concept and would only add using a pair of R -11 vise grips to hold the motor, reducing the chance of cutting myself. Set correctly they would be secure, provide leverage, and move your hand 10 more inches from the blade. They would add about 5 seconds to the process because you would have to re clamp to cut the back side. Just a thought.
Decided to edit this post and add a picture of the vise grips I recommended. I am sure there is a variety of names for them depending on your location, vocation, etc.
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