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You could have been a multimillionaire with your tremendous luck, but no, not you, you had to use it all up in getting a broken ezyout removed. If you ever get one stuck and broken, get the grinder and stock up on grinder point stones.
You don't have much room to work with but if you could find an old bolt and sharpen the tip to a point. Stick the point in the hole you drilled and with a mig welder, (if you have one) weld the sharpened bolt to the broken one then immediately try to turn the whole thing out while it's still hot from welding. It will be touchy I admit, too bad the broken bolt wasn't a bigger diameter.
This method has worked for me in the past on other cars. It's particularly effective when the remaining bit of the offending bolt is above the surface. If the remaining bit of the bolt is above the surface, sometimes you don't even need to drill - just heat it up and weld it to another bolt. A squirt of penetrating oil afterwards has been useful too.
Prayers said that you have enough thread to torque the bolt down!
What a tough job. On my 87, the bolt on one rear shock wouldn't turn, rust welded shut. We used a grinding cutoff wheel to cut the bolt through and hitting the bolt and rocking torque, it finally came out. Then the nut and 1/2 the bolt on the other side we rocked torque while I beat on the center of the bolt until it finally came out. All evening job. the replacement bolt, just like any other bolt I reinstall got antiseize applied to it. I feel for you!