A jigsaw with a fine tooth blade would do fine, or you could use a dremel with a carving bit. Melting the plastic shouldnt be too much of a problem. Usually in my expirences just the plastic sawdust shards melt around the bit, leaving about a 1mm or less ring that you can just pick or grind off, leaving a clean hole. You might be able to use oil or some type of libricant to keep the plastic from melting.
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