Hanging some dulcimers as a wall display
General mountain dulcimer or music discussions
Good question......I think I would experiment with eye screws painted to match the color of the wall and plastic clear zip ties or stainless steel zips painted or stained. Another thought is use some loop end strings, run them through the bottom hitch pins and put the one your going to attach to the wall under one of the strings running through to the bridge, pull it tight and twist it to secure making another loop or wind it around the eye screw or whatever your using. You might be able to make a sort of L bracket out of plastic or vinyl to run your wire through. If your are placing them on dry wall use some plastic or metal anchors with the eye screws..........there is a way but it might be trial and error until you find on that works for the bottom attachment.
Or If you used a flat rectangular piece of plastic, attached to the wall, behind the instrument you could run that wire from the hitch pins under the body and tighten it up enough so that the instrument will lay fairly firm against the wall.......wrap your wire under that plastic, through a hole in it and/or around a screw holding the plastic. If your worried about the screws that you attach the plastic with stick some felt over them. That way, if the head is secure you could angle them any way you wanted depending on where and how you placed the plastic piece.
Just a thought or two..........