Yes, it seems I have exhausted all other options. And if added up the time I've spent so far trawling the internet over this, it's probably more than covered the cost of 2x Momo's :(
There is also LeatherFX a forum member but he is rebuilding with new leather and has a very good video on AU momo retrims. I see some further forum members are using this service. And I've got a spare one that will need this process one day.
But it doesn't help me with getting a dye colour match :(
https://www.facebook.com/Leatherfx-598401293521971/