Not that it's any consolation if your camera is too old to have this, but with many of the newer Canon cameras having the ability to pair to a cell phone for both control and image transfer, it's not that difficult to get the pictures onto devices that allow for somewhat better editing potential, at least as far as cropping is concerned.
Obviously that isn't of much help if your camera lacks that feature, but perhaps a USB "on the go" memory card reader for a cell phone would help?