Slimbook laptops have function keys that allow activating a particular power profile (i.e. Power Save, Balanced, Performance) directly instead of cycling through all of them with Meta+B.
If it's important enough to put this on a keyboard, it's probably also important enough to give the option to any user to switch to a particular power profile directly. Perhaps Slimbook would even decide to assign their relevant keycodes to the respective PowerDevil actions if we provide them at all.