I'm not familiar with the 4 door but if you can get some vice grips in like you say i'd go down that road.
You wouldnt have much screw left to get out now.
You could always drill it out fully and put a nut and spring washer on the bolt if you can get in.
Just hang your vice grips on the nut and use the inside of the frame as your other hand.
I've had a crack at the series 3 hinge screws so I feel your pain good luck!
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