Possible to lock laptop keyboard when using external wireless keyboard?

There seem to be two basic methods of disabling a keyboard.

One method involves manipulating the keyboard's status in Device Manager.  Although for many devices there is a right-click "Disable" option, I suspect that for a built-in laptop keyboard, the only option will be "Uninstall."  The problem with using "Uninstall" is that Windows will automatically re-install the device when the computer reboots.  I've seen one proposal to prevent automatic re-installation by temporarily installing a non-compatible driver (https://superuser.com/questions/717133/how-can-i-disable-laptop-keyboard-but-not-wireless-keyboard-windows-7):

• Open Device Manager
• Select "Update Driver"
• If prompted to check online or use existing drivers, choose existing drivers only
• Display incompatible drivers (or de-select "Only use compatible drivers")
• Choose one
• Restart
• Keyboard is now disabled (and in my case, touchpad too, which I'm fine with)

To restore the keyboard:

• Choose the compatible driver
• Restart

Although you could create a batch file to use Devcon (https://docs.microsoft.com/en-us/windows-hardware/drivers/devtest/devcon-general-commands) to uninstall the keyboard without having to open Device Manager and do things manually, that would be fairly complicated.

The second method is to use a third-party tool that will lock the keyboard for you.  Caution:  I have not tried this myself, but How To Geek is a generally OK website.  https://www.howtogeek.com/howto/11570/disable-the-keyboard-with-a-keyboard-shortcut-in-windows/

Another method would require an external monitor.  It is very commonly used.  In that setup, you use a separate mouse, keyboard and screen (much larger).  Change the laptop setting so that closing the lid does NOT shut down or hibernate the PC.  This method requires a VGA port on your PC (most have them) or another connectivity method.

Those screens can be had for like $125 for a 21" one.