Cher Marc-Cubase,
As a fellow French user — I happen to have created the Dorico French users Facebook page as well as some documentation on Dorico for my french fellows — I can tell you there is a very straightforward way to use Dorico (Pro or Elements) as an addition to Cubase : export your files as xml, and you’ll be surprised by the output in Dorico, without doing anything. This is what surprised me most in the early days of Dorico. I could have spent hundreds of hours in S…, and a simple import into Dorico would make it look way better.
I do not say that the point you raise is wrong, but only that things take time, and this dev team surprise us with each update. Maybe it’s too soon for you to get onboard, maybe not. It’s up to you to decide, but whatever your decision, you’ll find some friendly ears here : we’re all dedicated to music.