We need a "Nintendo Switch Bent Gates Guide"!!!
I think it'd be actually quite easy to cobble together a forced air injection cooler for this device.. because it's small and flat, so you don't have to build any complicated air ducts..
What I would do is.. Cut a hole in the back of the existing dock and put in a high cfm 80mm fan.. Cut a corugated filter holder for it out of cardboard.. attach the device..
Then for the front of the dock, tape up the sides.. then take some more painters tape just apply it to the front and back of the nintendo switch where it meets the top lip of the dock, to make sure air injection is forced through the device rather than around it..
Overall using tape is a good idea, because painters tape typically leaves no residue or markes, is quite reuse-able, and you'd just tape it up whenever you dock it, wouldn't take more than 2 seconds..
You can make a more elegant solution, but It wouldn't work any better.. because the shape isn't designed to fit with a seal, so even if you had some sort of rubber/ silicone skirt, the seal would not be superior to tape.