Transmission Cooler/Cooler lines

So.......In my minds eye, the biggest problem is that you need to keep the eng running in N to keep the fluid circulating to cool the transmission(which no racer wants to do).

just spit balling here.
So in my mind the best solution would be a thermostatic controlled fan/cooler set up. But this does no good unless the eng is running............
So now i think, hmm what about about a pump? I could circulate the fluid and cool it down quick.........but the last thing you need is a restriction in your cooler line(external oil pump) maybe a check valve and then a by pass that run to the pump. when the pump is running it close the check valve and circulates the fluid.
any one know of a pump like this that could withstand 300+ degree oil and what? 150 psi of pressure????