#Simple way to create scratchpad for any window, you'll just need sxhkd shortcut:

super + { ,shift} + z
	{bspc node -g hidden,d=$(bspc query -D -d); bspc node $(bspc query -N -n .hidden | tail -n1) -g hidden=off -d $\{d\} -f}


It will unhide oldest hidden window