There is no doumentation on how to use bspwm: the bspwm -h command is useless and bspc -h option doesn't exist.
There is no pratical way to access to bspc options needed to configure the keyboard daemon properly.
man bspc and man sxhkd have all the informations you need
I suggest to add an actual help option using the -h flag both on bspwm and bspc, then is also a good practise to add code comments on sxhkd config file generated by default.
Most helpful comment
man bspcandman sxhkdhave all the informations you need