Force keyboard re-identification in Catalina MacOS
I had the issue where I could not find Change Keyboard Type in that interface after migrating to new Mac with Big Sur and wanted to force keyboard re-identification.
Deleting /Library/Preferences/com.apple.keyboardtype.plist (as suggested above by JMY1000) and rebooting solved it. After the reboot the system ran the keyboard setup again and I could set the correct type.