Hey. The Octavi is programmed to use the buttons you see on the unit, so it can't (as it is) control specific functions that the DCP/CCP would control. There's some overlap, of course, but not that much.
For the DCP/CCP I would look no further than this:
https://avioniquesimulation.com/product/dcp-ccp-panels/
I have one myself (from before the current crowdfunding), and am part of the current crowdfunding of the other stuff, so these days ( one more day!) is a good time to get one to help. It's an awesome unit that will help the workflow in the Challenger + add immense immersion. Besides, it just looks really cool. ;-)