Contact Hugo Studio and see what they are willing to try?
https://hugostudio.com/ Maybe you could get something printed on a sign vinyl, have them apply it to a base material and then then they cut it to fit?
Any sneaker stores in your area, basketball shoe collectors? Because there is a culture of people painting them up with designs and patterns, etc. Some very talented people doing this stuff. Which means that they know how to make color stick to leather and fake leather. I bet tattoo parlors would also have some leads. Now this could get expensive one-off work, but might be worth it.
Be worthwhile doing some photo comps before getting custom work done. Take or grab some photos of the camera and lay the design(s) into the leather areas to see how it looks.
If the world can survive having an M3 looking like this in it, it can survive a Rolleiflex looking like a coral reef! Go for it.
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