Broken valve cover bolt in AFR head.

If you read the other thread about my oil problems, you will see that I have...well, oil problems. My engine is out of my car right now. One source of my oil leaking is my valve covers. I have the AFR 185's on my car and the TFS short valve covers. I am using the blue rubber gaskets from Felpro and they leak like crazy because of the small surface area of the AFR's. I bought cork gaskets to replace them with but I dont' want to do that until I get the top right passenger side bolt extracted from the head. It bottomed out and broke and I cant extract it. I bought some new drill bits made for metal and drilled about half-way into the bolt. I stuck the extractor in there and the tip broke off at the bottom when I started drilling it out. Now, since the extractor is made of a strong material, I cant drill through it and I cant get the damn bolt out. This sucks! Does anyone have any ideas? I have JB quick weld on hand. Also, could I get by for the time being with no bolt in that hole? I need to get the engine back in my car as soon as possible. Will it leak?

Yes, the heads are on the engine. Its just the tip of the extractor that broke off. Its at the way bottom so basically I am dealing with a really big hole right now. I could glob some JB in there and make a ridge at the top where I could use my dremel to make the required cuts for a screw driver. Before I used the extractor, I used the dremel and made one cut for a flathead because there wasn't enough of the bolt hanging out for 2 cross cuts. The flathead screwdriver just sheared what was left of the bolt right off.

My JB weld idea didn't work. The stuff just turned to powder. Now I am going to try to JB weld a screwdriver into it like you said. Hopefully it wont turn to powder.