Yes I think it might (in theory) be possible to flash different firmware.
By way of comparison, I have an external wide SCSI CD writer. Inside is a Sony CRX230EE ATAPI drive and an Acard IDE-SCSI converter. On the converter PCB is the text AEC-7720UW. So depending on the firmware, the 7720UW can handle ATAPI devices. [The Acard FAQ page says the 7720UW is only for IDE hard drives.]