I've bought Dorico in the meantime and actually found I can get reasonable results with the articulations just by starting with the Cubase strings map remapping the most important entries to the actual controllers/keyswitches used in the default "VSL Preset Level 2" with the Solo Strings. The most important articulations all seem to work except gliss which is (still) unsupported by Dorico, even in the new v3.1.
One thing which I still can't fully understand is dynamic control. VSL defaults to CC7 volume, CC11 Expression for strings, yes? One would think that the Volume dynamic in Dorico should be set to CC11 as appears to be the case in the Sibelius soundset. But it seems Dorico only transmits dynamics (as written in the score) to VSL through velocity and indeed the Cubase Expression Map is set to Note velocity. Frankly I couldn't care less (leaving aside for the moment questions of possible timbre differences) except of course that velocity naturally does not allow a dynamic change after the note in sounded and will require a doubling through a CC which can be done graphically in Dorico.
I've just seen from a different Dorico thread that Andi advises Velocity as primary dynamic controller together with VelX crossfade as a secondary. In actual fact my own tests led me to also to this but of course as VelX sends all the volume levels at once, you need to somehow compensate for the overall higher dynamic for instance. Any Dorico specific tips for the settings both in Vienna Instruments Pro and in Dorico -- for instance the optimal Dynamic Curve setting in playback settings?
many thanks, David