it is possible to change the imei no on a e700 with a usb cable as i have done it.
i bought a usb cable complete with driver disc from a local market and fired it up.
ran software by myky, selected enter tat then straight forward from there.
ran software through com 5 which must be the usb port.
so if you can't get hold of a s500/e700 cable try usb it worked for me.
by the way this was done on my own phone at my own risk. the imei was put back to the original in case someone has a go saying it's illegal, which of course it is.