Sonokinetic released Sordino Strings to go with their new Orchestral Strings library. It's 'only' sustains with and without vibrato, and staccato. Plus sforzando and fortepiano. With Sonokinetic's clever engine in the back, there's quite a lot you can do with these articulations. These sordino strings have been recorded with the same divisi sections as their Orchestral Strings.
https://www.sonokinetic.net/products/cl ... o-strings/
30% off currently. After that, it will go to a still very reasonable full price of 75€.