That's probably how I would approach it as well to create some realistic space and variation in distance. But I don't own CSB yet. YET!
For the strings alone, I'd rather boost some air to make them a little closer.
yes but the close mic would be a great option to add in some bite. I lately try to create a different template by layering CSS using the classical legato patch (the Close mic) with CS2 (stage mic). So far i like the sound of it.