I installed the MPK261 using this tutorial at AKAI:
https://inmusicbrands.force.com/akaipro/s/article/Akai-MPK2-Series-Setup-in-Steinberg-Cubase#software_setup
Under point 5, one can download a preset file for when you set up the keyboard as a generic controller.
I’d like to test your preset file, maybe it could save me a lot of fine tuning of the AKAI setup.