Ok, first I would go to a machine shop supply and see if you can buy some drill stem quality tubes. Then you grind notches on the end and you cut through the original bolt but around the ez-out.

If that is not possible you could make your own EDM machine for very little money ... but would need to be careful about the electricity...
There are plans available... make the one which uses a lightbulb for the frequency of discharge AND the amount of current... something of a fail safe system .. the bulbs are used both as fuses and as the method for adjusting the working of the system... You can use kerosene as long as you keep the electrode under it... a couple of power rectifiers, a couple of electrolytic capacitors , the bulbs, a way to incrementally move the electrode into the metal... you can use carbon from the inside of an old carbon D cell battery or buy the real stuff... carbon arc rods can be used also....