Do I need to replace my keyboard?

I had to order a new esc key. When it came, it shipped with the cap, hinge and rubber cup. I thought that meant the old rubber cup could be removed. So I pulled the old one out. Is there any hope of repairing the one key?

If not, I know where I can get a replacement keyboard for $80, which is way better than $850 for the entire assembly. My only concern would then be getting the new keyboard in, while leaving my AppleCare intact.

Edit: It occurs to me that a picture of the damage would help assess whether or not I'm going to have to gut my laptop. Or pay $$$ I don't have for a pro to do it.

I'm trying this stuff as adhesive to glue the cup back on. I'm having trouble with finding a way to keep it in place for thirty minutes though.

So far just having the key cap and hinge attached with the cup activates the contact, making the computer think the key is constantly held down.

Edit 2: I can't figure out how to get some paragraphs to go between images to make it more clear which image I'm referring to.