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Just an fyi---the large pro wide format Epson printers such as the 9890 and 9900 are also similarly limited in their print length by the Epson driver. It is the same issue.
Afaik, only printer utilities such as Qimage or a printer RIP will allow you to get around the print length limitation imposed by the driver.
I know you haven't tried Qimage; I have used it for years, and it works. Long panoramic images that I could not print from Photoshop, are easily printed with Qimage. Chaney states it pretty simply from his website: "In addition, Qimage can overcome printer driver length limitations entirely if the driver offers a roll paper/banner paper selection, allowing Qimage to go far beyond the 44 or 127 inch limit of your driver! It is not uncommon, for example, to hear from Qimage users who have printed one contiguous panoramic print 20 feet long when their Epson driver stops at only 127 inches!"
I know of no other means outside of Qimage or a RIP that the OP can print larger than the driver limitations.