Have now had a chance to carry out Steve's suggestion of dragging V2 cells onto the old ones in a copied instance of Solo Violin and Chamber Violins. However, I did it with the respective presets which were created for Sibelius users. What I discovered is that about a third of the new V2 patches never had V1 equivalents in these presets, so I can't load all of them. I hope this is something Vienna can look into - as would be the chance to load the full presets.
The other thing that struck me while doing this is the duplication (and more) of the same cells in the matrices. Why do they need multiple instances of pizzicato or tremolo? I can't remember why this is - and why therefore there isn't room for a greater number of articulations in the Sibelius presets.