It’s pretty easy to do a global find and replace for the Volume Dynamic.
In Play mode go to expression map setup:
Import the Cubase expression map
Export that as a Dorico Library file
edit the Dorico file:
Find and replace all entries that match “param1>0<” with “param1>11<”
Find and replace all entries that match “kNoteVelocity” with “kCC”
Import the edited Dorico Library file in Play mode