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Without root you can do nothing more. With root you could, but only at the cost of making all app installations or updates impossible.
thanks!!!Remove the relevant system components, such as the package installer.
But at this point you require root (not possible on all devices), you don't have the ability to install or update anything, and you'll also not receive system updates and will have to repeat the procedure if you update the ROM manually. And of course if the person using the device knows even slightly what they are doing they can use the access a rooted device has to undo this. If your motivation is "security" in some way don't forget that root also makes it easier for any malware you get onto your device to really screw things up.
Your call, of course.