I am trying to find a harness like that, or who made that violin.
I saw Shar has an electric violin that doesn't need a shoulder rest or chin rest. But what I want is a harness for my acoustic violin. I've been playing many years, but now I have a neck injury.
http://www.woodviolins.com/html/viper.html
Other than this, I am not familiar with any other such harness systems as you describe, especially for "standard" acoustic violins.