I made a quick guide to install and configure Sway on the Macbook Air. Should be useful to solve some touchpad and scaling issues with the defaul sway settings.
https://github.com/jaime10a/SwayM1
It's probably better to swap the command and option keys via the swap_opt_cmd=1 parameter on the hid-apple kernel module that way they are globally swapped, not just in sway. fnmode=2 is another useful one which sets f1-f10 to be function keys by default so e.g. pressing f10 sends f10, not mute because you forgot to press fn+f10.