If you buy a dremel, and I believe EVERYONE should own one, how's about getting a cut off wheel for it & cut a slot in the head. Then take a 1/4 flat head screwdriver fitting( or a stubby flat head with a square shaft) & clamp it with some small vise grips & turn left a bit first, like J6 mentioned, then turn it right. PBblaster is your friend, and if you don't have any, go get a can. This stuff works great.
If all else fails & you have to destroy the intake, ya gotta do what ya gotta do, right? Intakes do pop up on Ebay & there may be one on there right now.