Caution about sizing!

I was really disappointed with this order of acrylic charms. I have ordered charms at the "default" size previously and they are perfect for my purposes. The measurements on these came up in mm (rather than inches) and I didn't realize that these were the size of a large keychain, not a small charm. I decided that I would make lemons into lemonade and use these as keychains instead, but unfortunately the hole drilled at the top is very tiny and won't fit the keychain findings that I bought at the craft store. (The hole in these charms is MUCH smaller than the hole that is drilled on Sticker Mule's keychains). Unfortunately I don't know what else I can do with these. Super disappointed.