Yes, many have done it. The secret (if there is any) is they really only withdraw a very tiny amount of kiln air (which is all that is needed) which is mixed mostly with room air so the fan and piping can never overheat. The hole drilled into the kiln is on the order of one or two 1/4” holes, so fairly small and can be plugged up easily with ordinary kiln patch if you ever have a reason.
Here is an old video of me doing it and comparing the result with a manufactured system. https://youtu.be/etpa2Pc9Hug. Please note we added a vent above the kiln just to eliminate wax smell which downdrafts don’t capture. This allowed us to use a fan that cools itself. If you use a similar fan, or really any fan for that matter, you will need to make sure it has enough room air to keep itself cool. No more than approx. 110 degrees
My guess - he will find it easy.
If you desire to remove the heat produced by the kiln as well, he will need to design on the order of 400-600 cfm with a hood above to remove most of it. At that point you will likely need to ensure you have sufficient makeup air from outdoors as well.