Install Karabiner and disable built-in keyboard when a bluetooth keyboard is connected.

https://apple.stackexchange.com/questions/67133/how-to-disable-the-built-in-macbook-keyboard

Prevent Touch ID button to trigger:
1) screen lock: defaults write com.apple.loginwindow DisableScreenLockImmediate -bool yes
2) Accessibility shortcut (triple press): Apple menu  > System Settings (or System Preferences), click Accessibility, then click Shortcut. Then just uncheck every shortcut option and the menu no longer comes up.