Many thanks for the helpful answers.
At the moment I'm leaning towards the Komplete Kontrol S61. Aftertouch is important for me. Mainly because a number of my 80s synthesizers already support it and I would like to address it with MIDI. However, I assumed that the MK2 already does this. At least that's what it says on Thoman's product page: (Komplete Kontrol S61 MK2).
But if you write that this is not correct, I'm leaning towards the MK3.
But what I would still be interested in is whether it is possible to change the individual VST instruments (of a track) in Cakewalk with the T6 or the S61 MK3. E.g. from a LABS instrument to VITAL (just an example)?
The background to my question is that I have three racks, each with 3 instruments, and behind me is the 19" rack with the mixing console on top. There is very little space for the computer, which is why it is a bit far away. That's why I want to be able to control as much as possible remotely with the keyboard. If that's not possible, I'll have to rebuild.