Bob,
Most EL inverters output the same voltage, unlike the CCFL inverters. You don't have to necessarily use the one that is listed in the datasheet. If you go to
AllElectronics and search for EL inverters, they have one that is designed for the EL rope (can't remember the exact part number right now). This should handle your backlight without problems.
Another source is
Electronics Goldmine, but it seems they are currently sold out of the inverter.
Of course, they is always Ebay too. Do a search for EL inverter on there and you can find some pretty cheap that should do the job nicely.