I just wanted to point a forum user to the Manjaro Kernel Manager and tried to find a CLI command to open it directly rather than navigating there graphically. According to the help output it is possible with the -m option:
manjaro-settings-manager -m <module>
should open any of the settings dialogues directly.
However, I couldn't find a list of available module names, neither in the help output nor on the wiki page, and none of my guesses worked. It would be nice if there was a list of available modules in the help output or an option to display them (like --list-modules or similar).