So in the end I went for the Moroccan Orange genuine leather from Hugostudio. It might not please the purists but I really like it. Of course I'll keep the original black leatherette (which came off without damage) in case I or a future owner wants to go back to original.
Would I do another one?...... Not sure. I'm happy with my silver ME Super as it is. My black MX is a bit dented and brassed on the top cover and fresh leather on that might look odd. I do have a black MV which is in very good condition but I'm not sure what colour would go well with the black body.