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@BrickMan
^^^ take a junior hacksaw blade (for metal) out of the saw (or spares), if its too big to fit the end of the blade into the 5mm allen bolt hole then just file the back of the blade down a bit, you want a bit of movement.
Then get sawing! you'll only have a few mm to move the thing and it could take 20 painful finger chewing minutes to get a slot made. Your aiming to make a slot opposite each other so that you can get a jumbo screwdriver (or other tool) into the cap and remove it. You won't hurt the cranks unless as the end of the blade will only be ramming into the front of the crank bolt head (can't hurt it). But would cover rest of crank in masking tape/ duck tape to protect it from scratchs just incase of butter fingered moments.
Good luck! I Had same thing happen with a crap chromed shimano dust cap, took a lot of cursing to get it out via that method, but worked and didn't hurt crank.