First tests with audible prompt worked, so changed the subscripts to use the same method. It should now use audible prompt when available and not give an error if it is not available.

.includes/chuser.sh

@@ -48,7 +48,7 @@
     fi
 
 # Heredocument left-aligned
-cat << EOF | sudo tee /etc/cron.d/0chuser &> /dev/null
+cat << EOF | sudo "${sudoFlags[@]}" tee /etc/cron.d/0chuser &> /dev/null
 SHELL=/bin/bash
 PATH=/sbin:/bin:/usr/sbin:/usr/bin
 @reboot root usermod -a -G $groups -m -d /home/$newUser -l $newUser $oldUser && sed -i -e "s#NODM_USER=.*#NODM_USER='$newUser'#" -e "s#NODM_XSESSION=.*#NODM_XSESSION='/home/$newUser/.xinitrc'#" /etc/nodm.conf; rm -f /etc/cron.d/0chuser;reboot
@@ -57,5 +57,5 @@ EOF
 # Heredocument end.
 
     # Files in cron.d must be 644 to work.
-    sudo chmod 644 /etc/cron.d/0chuser
+    sudo "${sudoFlags[@]}" chmod 644 /etc/cron.d/0chuser