actually no the fan housing and whatnot would survive.. the stators.. different story
but my thought your just complicating the simple.. make the channel... dont close the back off so much 1/2 in tubing will deliver VERY LITTLE AIR with aircraft we simply channel the air over the over the head.. directing it of sorts.. use your funnel make it at minimum the width of the head.. you dont wanna try to force air throught the fins as that will cause turbulence and ultimately slow down the air if you build a simple funnel that reaches from the window to the engine about 1/2 inch before the head youll get a much greater airflow and more efficient cooling..

now onto something else..i think your temps are a bit off.. a nitro engine simply wont run at 200c or 392deg F !!!!!<<<!!! the rod would fold lol around 285 they just shut off.. thats fahrenheit lol the cylinder wall expands and it looses compression