One interesting thing that I realized when I was messing around: when I reset my headunit, Imprint settings do not reset. So the memory might be within the Imprint box rather than your headunit...so you might get lucky.
I installed the IXA-W407 in place of a CDA-117. The good news is the Imprint did transfer or more exactly stay in the Imprint module while disconnected from power for over a day. New head unit worked with no issue, though disappointed I lost RSD on the radio.
Anyone know if I add the HD tuner if I would get the station and song info?