I’ve added 0-line and 1-line non-percussion instruments to my Sketch category as below. (There are a bunch of other custom instruments added to the files as well.)
Here are the files if you want them. All the usual caveats about edited factory files apply and they will be overwritten with any updates.
instruments.xml (3.0 MB)
instrumentFamiliesDefinitions.xml (29.0 KB)
instrumentnames_en.xml (353.4 KB)