Amanda, I contacted someone who's been working with feral cats for many years. My first reaction reading your initial post was - there is something wrong with this cat. Feral cats do NOT approach people to attack them unless there is something wrong with them. In fact, this struck me as a kitty that was likely abused and now has neurological damage. Either that, or perhaps a brain tumor or something.
This is what she had to say:
I suspect this trap savvy cat is quite dangerous and this is a situation that really needs to be reported to animal control.
(I know you have). Report it as a possible infectious animal (gets the powers to be out there quicker). Let the Animal Control deal with it- which means they dart it, net it and haul it away. If the Animal Control refuses to act- then she needs to call a pest control company and pick their brain.
She could also try taking a small mirror that fits right at the end of the trap and adhere it with duct tape to the
outside of the trap with the mirror image pointing inside the trap. This aggressive of a cat will want to attack the stranger it "sees" trying to get to the food and should rush into the trap. Make sure the food inside the trap is put on a paper plate, or a piece of cardboard and the mirror is taped OUTSIDE the trap. Otherwise, kitty will hurt himself with any hard objects inside the trap. Use KFC chicken and break it apart. Ask the chicken clerk to give her some pieces that aren’t fully cooked- the rare meat will attract this cat quicker.
Sounds like kitty is in a PTSD state of mind, very ill or infected with something that left neurological damage- including any abuse. She needs to act fast and get the cat out of there before he really hurts someone. Call a local vet and talk with them about the situation- perhaps they can provide a sedative for the cat to calm him down once he's in the trap. Whatever she does, when the cat is trapped- disengage the mirror immediately and throw a dark cloth over the cage and get the cat to the pound or the vets office. Sounds like the kindest act for this cat is to put him out of his misery.
Tell her if none of this works for her, put her in touch with me and I will help her privately to the best of my ability. I have unfortunately run into these types of cats and there is little hope for socialization as the damage done to them either before or after birth was too extensive. Some things you just can’t fix, no matter how much you love cats.

Since I sent the message and received the reply, you updated with news that animal control will be stepping in. But thought I'd provide the information in case they're not going to be using a dart and trapping is still an issue.
I'm so sorry you're having to deal with something so traumatic.
The other "trap preparations" that will help:
1) Wash the trap. Remove the scent of fear and other cats from it.
2) Place cardboard down on the trap to cover the wires up to the trip plate OR pour dirt or litter over it so the cat doesn't have to walk on the wires. The trap will lift right up through dirt or litter.
Don't use the mirror method if you have to leave the trap with a cat in it for any length of time before you can get to it and get the mirror off of it.