I have tried a different approach.

I printed on plain paper the color/bw artwork (or even on a digital photocopier from a pdf file).

Then laminated the paper and cut it to the dimensions needed.

This works good even if one has switch underneath or LCD (you have to cut carefully the window).

Of course it is not possible to make a dome at the position of the virtual button, but it is a prototype, right?

Ioannis