Way 1:
SKIOVOX EXPLOIT
log out and disable wifi and forget all known networks
click Apps and select one while also simultaneously pressing alt+shift+s, that should have the chrome menu open while the App is booting
when the app goes to the "No Network Found" screen, using the chrome menu, open "Accessiblility" and click on the question mark at the top of the menu. This should close the menu. Now there are two ways this can go:
A: Click the "Create New Network" button and leave it at the config menu. The app should load.
B: Reconnect to the wifi you were using before. The app should load.
when the app loads, press ctrl+alt+z. This enables ChromeVox.
when enabled, hold the Search button (or the button with a magnifying glass) and press o and t. This opens the help menu.
click the bottom option and the bottom option again.
this should open a chrome tab that you're not signed into. good job.
press ctrl+alt+z to disable ChromeVox.
Way 2
Needs skiovox helper i think, works on latest version
Sign out
Press shift + ctrl + alt + R and press cancel
Turn off wifi
Open your kiosk app and press alt+shift+s QUICKLY
Wait for a no wifi screen
Press accessibility, then the settings icon
Press "sign in as existing user"
Enter your username and password
Press esc to cancel the multiple user dialog
Click the settings window at the bottom of the screen
Turn on WiFi
Press shift + ctrl + T and pray