wow! what a great idea on the angle grinder!
and, you certainly seem to have a great project going.
consider using mosfets and your thumb to create a cheapy motor controller - push the button for a few seconds to get a boost. the longer you hold the button down, the faster you go.
also, you could use a capacitor/resistor delay setup like a wiper delay. use an adjustable reostat for variable power.
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