I simply use FireFox with a “Run on startup” app to start it along with a FireFox add-on that makes it run full screen. I disabled the lock screen using the developer options (setttings -> about tablet -> click on your serial number 7 - 9 times to enable developer mode, then disable screen from locking). See here for more info: Post 24 of my Konnected Writeup
Only time I ever have to unlock my screen is if I reboot the tablet which isn’t often at all.