Hello Claude Marc!
I agree. Converting Cubase Expression Maps to Dorico can just be a first step. These converted Expression Maps are not really functional.
I know that these "Articulate Presets" from "Symphonic Riot" exist, but we haven't tested them and cannot support them.
In fact, I am in communication with him (his name is Kai). I bought several of his Emaps, and his templates. I have to say it's pretty awesome. A huge job on his part, with very good manuals. He is of a very high standard. In addition, he helped me beyond supporting his products. Chic type. Concretely, there is an Expression map called "VSL Compatibility map". Not as refined as what it comes with its presets, but it's compatible with your VIpro Presets. For the saxophones of VI, so far, it's going very well. That's the best thing we have for Dorico.
ps. For all that is the VI collection, his work is wonderful and reliable. I use it for BRASS, CHAMBER STRING, etc.