You could start with Expression Maps for Special Editon Volume 1 and see how that works (you have the VI Special Edition Volume 1 registered
Your gain is the grattitude of your fellow Dorio users.
A few words why this is not such a trivial task:
AFAIK, Dorico only covers around 50% of the articulations available with our bigger library products, so you will have to create new articulations in Dorico and assign them to the corresponding articulations in our libraries.
Consistency and accuracy is key in such an undertaking.
The next challenge is that a dedicated Installer (like for Sibelius) has to be created, that places the correct files in the correct locations (manual installation is very tricky, unfortunately).
We don't have ANY resources to support this process right now, so my suggestion would be to start small and work your way up from Special Editon Volume 1 (which doesn't need many additional articulations added).
The alternative is to wait until Andreas has the time to provide you with the high standard flawless expression maps you are used to.