I have done this. PLEASE PLEASE PLEASE don't be an idiot like myself. After poking a hole, make sure to seal it properly with something like crazy glue. If you don't and then wax, it will get in no matter what and look like garbage basically forever.
I did mine with a hairdryer. Worked out pretty decently, the mylar was so raised that it drastically altered ball movement. Upon completion, one spot was 100% fixed and the other spot (ball drain on Pin-Bot which has 4 inserts) approximately 75%.