Do you know of anyone whose Mac you can "borrow" briefly or, perhaps, an external optical drive? You could then make a disk image of the CD/DVD using Disk Utility & copy that to a flash drive. If you live close enough to an Apple Store you could make a Genius Bar appointment & I'm sure they could help you.
iWork '09 on the CD/DVD in the retail box does not require a serial number. Only licensing the downloaded trial requires a serial number & it is only one number that licenses all three apps.
Someone else sent me a link to do it as is, but it's making my head spin.