Photography advice, lyra interior

[phaedon]

I have a 19th-century Istanbul lyra (pear-shaped fiddle) which has quite a bit of writing, in pencil, in Armeno-Turkish on the underside of the soundboard. Since I don't read Armenian, I need to photograph the entire inscription to get it translated.

 

The soundholes are D-shaped, approx 38x26mm in size, so it is possible to get a dental mirror in there. However, the writing goes pretty far up the soundboard, so at some point the mirror handle gets in the way.

 

I also tried ordering an endoscopic webcam (~$65) from Amazon, but the focal length was not good enough and the solid part of the camera too long to point it straight at the writing.

 

Any new ideas or suggestions on how to proceed? There is definitely valuable information there about a 1920s-era restoration, and maybe something about the maker, too, but I can't move forward until I photograph the whole thing. (Removing the top is not an option!)