You won't even have to do that apparently. I've been doing some searching, and all you have to do is edit wuaueng.dll so that IsCPUSupported always returns true. Here's some information I found on it: https://github.com/zeffy/kb4012218-19
Edit: I just tried this myself, I have a newer update that changed the patch, so I made a patch myself. I can see Windows Update again and get any update I need again. Can confirm this works.