Welcome Chris.
Cruise retrofit should just be a new stalk, and coding. It's possible there may be a can bus issue, but unlikely.
You have a midline dash, there. A highline cluster has a full height display, and can show more data, such as audio track and sat nav direction/compass(dependant on head unit), as well as access to the set up menus such as convenience (set lights on delay after stopping etc).
Having just gone to a highline, it's a big step forward if the car is equipped to take advantage of it. If you have multifunction buttons & RNS510 nav unit, it's a must. As the car is DSG, fitting MFSW buttons is straightforward as well.
You should look in the VCDS area at the sticky for highline replacement. You need to source a compatible unit to swap out your midline. You'll need to scan the car with VCDS to get your midline part number or pull out the cluster.