yeah you could try a jewellery store, finding an extractor that small might prove difficult though you could try Amazon and extractors are pretty cheap.
You would need to drill a small hole first,say 1mm then enlarge it in 0.5mm increments until you had a hole big enough to screw in the extractor which will screw in counter clockwise by the way.
A normal home drill would work but you will need a steady hand not to break the small drills.
By the way the parallel plug would still hold in pretty well with only one retaining screw a lot of people never used the screws anyway.