We did. I can confirm that the 4D0907558 is a Euro S6 pre-fl binary. I'm pretty sure I could find a car you're looking for but I have no idea how to read the TCU flash.
As far as I know, it's a desolder job. So, if you don't have the file, I don't want to burden you with acquiring it. I'll try to look into modding CAN messaging within the ECU then.
Thanks.
EDIT: For sake of completeness, changing FMOTC did the trick. Everything else related to CAN messaging was similar anyway.