So while I'm struggling to get my NI stuff to work properly I decided that updating the keyboard itself maybe could iron out some issues, but that has now turned into a new headache.
I downloaded the updater (The link on the keyboard screen itself doesn't lead to the updater, by the way, and I had to search for it manually, and a lot of the links I can press when reading NI support documents just lead to a empty "not all who wander are lost" page… Someone should probably look into that as a separate issue…)
I've ran the updater many times and I just get stuck with this Error -2 every time. And now it seems I can't get the keyboard to even play anything and is essentially non-functional.