You are so silly...
Do you actually think that this problem hasn’t been encountered before in China? There are all kinds of work arounds for this. Not a problem. Not at all.
DIY is very big in China, and the number of small mom-and-pop shops offering to do this kind of work number in the tens of thousands.
No, re-registering the four secure components is a big problem. It's one reason why you see lots of components but very few complete Frankenstein-iPhones for sale. Before Apple incorporated these inter-registered components iPhones were THE number one stolen item in big cities. Now the thieves have gone back to something the fences are willing to buy that can be resold. iPhones are unusable except for spare parts on the black market.