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I don't think making the hole bigger would help. Inevitably, no matter how careful you are with a drill bit, if you do this, the hole size will increase.
I would clean the sharp edges off with some fine sandpaper across the top side of the rim. This would allow the rim tape to sit flush and not puncture the inner tube from the rim side. It should be okay for a few weeks but I wouldn't be doing the TCR on it.
John-The.Raven
I might be tempted to drill it with a sharp metal bit, to "clean up" the edge of the hole. That should help prevent cracks starting, as I understand it.
Ask @mdcc_tester for the gospel answer.