The exact articulation I'm looking for the three-note motive in anacrusis is the performance détaché. This is a legato where each note begins with a bow change, making them slightly but smoothly accented.
This is unfortunately unavailable in Dimension Strings. Something similar is in the legato repetition, but then notes last too little (it's about a half-second détaché). Time-stretching doesn't seem a viable solution.
This articulation is also available in the new Elite Strings, but also in the old Solo Strings. Blended with Dimension Strings, these latter seem to do wonders. I'll see how it works with all the melodic lines.
Layering in Dorico is not a quick task, since all CC data are to be entered by hand again, with no chance to copy and paste them in different staves.
Paolo