Use a cordless drill with a good battery. You will need a hole saw about 3" or even better, 4" in diameter. Put the drill with the saw attached in a backpack and wear it into the rest room. It will be noisy, so you have to make sure that you do it when nobody is around. If you drill through the composite partition, it will be faster and less noisy than the steel panels. I would suggest cleaning up the shavings, etc and leaving it as if it has always been that way. A note: If you get caught, you could be charged with vandalism.
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