Bitwig Preset Inverted-Keys
Turns keyboard upside down. And you can change the axis of rotation. Default axis is C. When you press C you get a C. When you press C# you get a B (so -1 instead of +1). The rotation only works per octave.
This is a companion discussion topic for the original entry at https://bitwiggers.com/presets/1637126f-c394-4dba-b458-3fc1b1ef6214/