That blower will produce a much higher pressure then a computer fan, it looks like a good choice and a reasonable price.
I'd do both switching options, that way the fan is on whenever the motor is to keep it cool and the fan will stay on if the motor is hot and it should then stay on even if you park the car.
I'm not sure how you plan to attach a thermoswitch to the brush, my motor brushes are to small to do that and the brushes need to be able to move freely.
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