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most controllers have a half speed input, mostly used for reverse but also used to have kick on when the batteries are getting low, a simple snap switch could also be used to click the controller in to half speed to keep it from over heating as much, two snap switches, one that clicks on 10F cooler with a dash light would be a nice idea too, placing it next to the air output or almost touching the rear end of the motor shaft would be the two places I would place them, in an ideal world you'd have a thermal couple measuring brush temp but that gets more complected but it's done sometimes.
Snap switches are cheap enough that I would get some that are set for around 200F to 250F because the areas you can place them are going to be cooler then the parts that you want to protect.
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