Col legno workaround
Maybe you've done this already. I figure a col legno is more brush than pitch, so my solution is to use strings pizzicato but at a low volume, together with a jazz brush playing the same rhythm, and at a slightly higher volume. To get a jazz brush, you click on Instruments > Percussion - Unpitched and select Drumset. Then in the mixer you can check the Drumset box, in the Sounds dropdown select "Brush 1", and for the note select "Electric Snare".