Amazon and Ebay have replacement screens. You will also need a triwing screwdriver. You probably don't need a new digitizer, but my buy a new one anyways.
But let me tell you what happened to me. I tried to replace my screen. I broke a fpc connector for the backlight. Trying to fix it, I slightly broke the flex cable on my new screen. This is now a difficult thing to fix for someone without microsoldering tools and experience.I don't know what I'm going to do from here. Get a working gamepad and sell off individual parts? Seems like a lot of trouble. Find someone who wants to but it as is? Maybe.
So keep this in mind, how good are you at these kinds of repairs? You want want to have a service fix the screen for you so that you don't end up accidentally breaking it worse. Or you could sell your broken one, let someone else fix it. maybe I'd buy your broken one, or just put it up on Ebay.
But if course if all you really care about is blocking updates, then there's other options. Try to change settings blind. Block updates through your router. Borrow a gamepad from a friend. Buy a used console from Gamestop, change your settings with its pad, return used console for a refund. Rent console if possible. But a brand new console, use it's pad to change your settings, hack new console for piracy, sell it in like new and hacked condition for a profit. Maybe use that profit to get yourself a working pad.
You have to decide what's the best option for you. If anyone can help give me ideas, let me know please.