OP- Are you adverse to SMCFan Control? It seems to be the best solution, IMO. And for the record, I don't have it nor have I ever used it, I'm just observing this thread. My MPB heats up, but I haven't ever had it go to sleep for that reason. If I started to get issues like that, or if I'm bored and want to tinker, I'd be getting the SMC Fan Control app. Actually, I used to have a Camaro and a manual fan switch to keep the temps down- and it worked beautifully.
The only reason I say it may be worth another look is a cooling pad is going to be money, no matter how nominal, an additional "thing" to have with your laptop and it may take up a wall outlet or a usb port. SMC Fan control is $free.95. Of course, do what you want, I'm just trying to raise a good point that seems to have been glossed over.