GUIVT and TTYVT are swapped

GUIVT="${GUIVT:-2}"
TTYVT="${TTYVT:-1}"

switchtty() {
	currentvt=$(cat /sys/devices/virtual/tty/tty0/active)

	if [ "$currentvt" = "tty2" ]; then # switch to tty1 with normal UI
		chvt "${TTYVT}"
		killall "$KEYBOARD"
	else # Switch to tty2 with $KEYBOARD
		setfont "$FONT" -C /dev/tty2
		chvt "${GUIVT}"

Shouldn't GUIVT be the tty of where you have the GUI?

First part has "switch to tty1 with normal UI" and changes to TTYVT: chvt "${TTYVT}".

And the second has "Switch to tty2 with KEYBOARD" and changes to `chvt "{GUIVT}"`.

So I think that GUIVT and TTYVT should be swapped.