I like your thinking outside the box.
I have a hard time seeing something like that work.
My suggestion, though impractical for other reasons, is for you to have a dozen different guitars to play. Then the client could say, I like this about this one or I like this about that one.
No fancy inlays or rosettes or purfling required.
Just pure tone examples.
I'm sure you could put that dozen together in no time at all.
