They also sell pedals, which, I guess, you could use to switch layers. I am thinking about using pedals to switch to the arrow keys layer. I wonder what other uses the pedals have?
IME the pedal is even more clumsy than pressing two keys to switch layers (I've had an advantage pro for ~15 years and am now using a planck and also building my own split keyboard to replace the planck with something more ergonomic).