This is not redneck engineering, it’s how evening is attached to walls in the US as far as I can see. An ugly hole in drywall, and cover the rough edges with trim. I’m not sure what else you are looking for.
Something outside the wall could use minimal wood working and nails or command strips.
It may not have been your intention but your comment came out dickish. Since your English is so good you should be able to phrase things better.