I want to point out a potential controller for Nuendo. It is a touch screen system similar to Slate’s Raven but more affordable (around $1000 total for a large screen). It would use Devil technologies D-Touch. http://www.deviltechnologies.com/index.php/products
It is software (no hardware) for Cubase and Pro-Tools and apparently works great. You use your own touchscreen monitor which you can make any size. Here is a link describing the software for Cubase and how to make a large touchscreen monitor. https://www.gearslutz.com/board/product-alerts-older-than-2-months/1004014-dtouch-cubase-multi-touch-virtual-control-sw-application-cubase.html?highlight=dtouch
I made a 42" touchscreen monitor which is pretty cool already without D-Touch, but it is limited. I naively thought that the Cubase version would work in Nuendo but it doesn’t and I am prodding them to hurry their development (they have said it is planned).
If you are at all interested, please contact them to let them know that there is a larger potential user base. No doubt it would speed things up. Just to clairify, I have no interest in D-Touch except wanting to be a user as soon as possible!