• With polybar hidden window count module.
• Needs fzf

The script:

#!/bin/sh

BIN_NAME=${0##*/}

unhide(){
        bspc node $(bspc query -N -n .hidden | tail -n1) -g hidden=off
        polybar_refresh
}

hide(){
        bspc node focused -g hidden=on
        polybar_refresh
}

unhide_all(){
        bspc query -N -n .hidden | xargs -I {} bspc node {} -g hidden=off
        polybar_refresh
}

hide_select(){
        bspc query -N -n .window | xargs -I {} dash -c "printf '{}\t'; xdotool getwindowname {}" | fzf | cut -f 1 | xargs -I {} bspc node {} -g hidden=on
        polybar_refresh
}

unhide_select(){
        bspc query -N -n .hidden | xargs -I {} dash -c "printf '{}\t'; xdotool getwindowname {}" | fzf | cut -f 1 | xargs -I {} bspc node {} -g hidden=off
        polybar_refresh
}

polybar_refresh(){
        polybar-msg hook hidden 1
}

help(){
cat <<EOF
        $BIN_NAME h       hide focused
        $BIN_NAME u       unhide focused
        $BIN_NAME ua      unhide all
        $BIN_NAME sh      hide select
        $BIN_NAME su      unhide select
        $BIN_NAME r       refresh polybar hidden count
        $BIN_NAME *       help
EOF
}

case $1 in
        "h") hide ;;
        "u") unhide ;;
        "ua") unhide_all ;;
        "sh" ) hide_select ;;
        "su" ) unhide_select ;;
        "r" ) polybar_refresh ;;
        *) help;;
esac

Polybar module

[module/hidden]
type = custom/ipc
hook-0 = echo H:$(bspc query -N -n .hidden | wc -l)
initial = 1

Together with sxhkd hotkey binding

#
# hide
#
alt + shift + h
        xterm -e hide sh
alt + shift + u
        xterm -e hide su
alt + shift + t
        hide h
alt + shift + r
        hide u