Hi - there may be some help via use of this tool here…
Expression Maps Generator - Create expression maps quickly - Cubase - Steinberg Forums
Nothing to download, it launches straight into your web-browser. Click on the ‘Help’ button at top left for how to use the interface. Its built by a 3rd party (non SB) and will I believe (I may be wrong.!) allow you to bulk change certain settings.
I’ve not used it in any anger myself, so can’t advise directly on your situation.
This post
Expression Maps Generator - Create expression maps quickly - Cubase - Steinberg Forums
..and this one
Expression Maps Generator - Create expression maps quickly - Cubase - Steinberg Forums
.. could give more clues to its power.!
I know, its a huge thread - but lots of usage info/tips throughout.
Anyway, I found the author of the tool quite approachable in the past. If you write a message direct to them or, simply tag them in to a post in that thread with any questions etc., you should get a response before long.
Good luck - hope that helps.!